Amendment Flag Current Fiscal Year End Date Document Period End Date Entity [Domain] Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Registrant Name Entity Central Index Key Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Legal Entity [Axis] Document Type Award Type [Axis] Significant Accounting Policies [Abstract] Components of accounts payable and accrued liabilities [Abstract] Accounts payable and accrued liabilities Accounts payable and accrued liabilities Trade receivables, net of allowances of $0.0 million Accounts Payable and Accrued Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Trade receivables, fair value Other goods and services Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated Other Comprehensive Income (Loss) [Member] Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Additional paid-in capital Additional Paid-in Capital [Member] Adjustments for Error Correction [Domain] Adjustments to reconcile net income to net cash provided by operating activities: Dividends in excess of retained earnings Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings Common stock and Partnership units tendered for tax withholding obligations Adjustments Related to Tax Withholding for Share-based Compensation Other Segment [Member] Other Segments [Member] Trade receivables, allowances Amortization in interest expense Number of shares excluded from the computation of diluted earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Asset Retirement Obligations Asset Retirement Obligation Disclosure [Text Block] Accretion of asset retirement obligations Accretion expense Asset Retirement Obligations [Abstract] Change in cash flow estimate Change in ARO liability and property, plant and equipment due to revised future ARO cash flow estimate Beginning of period End of period Asset Retirement Obligation Changes in aggregate asset retirement obligations [Roll Forward] Preliminary fair value of ARO acquired with APL merger Asset Retirement Obligation, Liabilities Incurred ASSETS Assets [Abstract] Total assets Total assets Total current assets Assets, Current Current assets: Assets, Current [Abstract] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Basis Swaps [Member] Deferred income tax liabilities, net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent Purchase consideration Other long-term liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other TPL contingent consideration Business Combination, Contingent Consideration, Liability Total distribution of common shares (in shares) Number of common units included in public offerings (in shares) Current liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Long-term debt Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt Pro forma consolidated results of operations [Abstract] Business Acquisition, Pro Forma Information [Abstract] Trade receivables, net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Revenues Business Acquisition, Pro Forma Revenue Business Acquisition, Acquiree [Domain] Pro Forma Consolidated Results of Operations Acquired debt and all other assumed liabilities included in purchase consideration Business Combination, Consideration Transferred, Liabilities Incurred Common shares of TRC Net income Business Acquisition, Pro Forma Net Income (Loss) Preliminary value of intangible assets acquired Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Other current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other Common units acquired Business Acquisition, Equity Interest Issued or Issuable, Value Assigned Business Acquisition [Axis] Other long-term assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Contingent consideration additional amount Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Contingent liability acquisition date fair value Business Combination, Liabilities Arising from Contingencies, Amount Recognized Business Acquisitions [Abstract] Closing market price of common share (in dollars per share) Business Acquisition, Share Price Business Acquisition [Line Items] Fair Value of Consideration Transferred [Abstract] Business Combination, Consideration Transferred [Abstract] Business Acquisitions Business Combination Disclosure [Text Block] Contractual receivables, gross amount Business Combination, Acquired Receivables, Gross Contractual Amount Acquisition-related expenses Business Combination, Acquisition Related Costs Total identifiable net assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Fair value of derivative assets Assets from risk management activities Net income from acquired business Revenues from acquired business Property, plant and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Noncontrolling interest in subsidiaries Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Preliminary fair value determination [Abstract] Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract] Contingent consideration liability higher range Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High Business acquisitions Total fair value of consideration transferred Total Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Contingent consideration liability lower range Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low Options [Member] Impact of capital expenditure accruals on property, plant and equipment Capital Expenditures Incurred but Not yet Paid Common Units [Member] Capital Units [Member] Carrying Value [Member] Cash and cash equivalents Cash distributions Cash Dividends Paid to Parent Company by Unconsolidated Subsidiaries Cash and cash equivalents, beginning of period Cash and cash equivalents Cash and cash equivalents, end of period Cash and Cash Equivalents, at Carrying Value Cash acquired from acquisition Non-cash Investing and Financing balance sheet movements [Abstract] Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Cash Flow Hedging [Member] Supplemental Cash Flow Information Class of Stock [Line Items] Common Stock and Related Matters [Abstract] Class of Stock [Domain] Accounts receivable securitization facility Contingencies (see Note 16) Commitments and Contingencies Commodity Derivative Contracts (Asset) / Liability [Member] Commodity Contracts [Member] Common stock, shares issued (in shares) Common Stock, Shares, Issued Common stock ($0.001 par value, 300,000,000 shares authorized), 56,442,449 shares issued and 56,030,634 shares outstanding as of June 30, 2015, and 42,532,353 shares issued and 42,143,463 shares outstanding as of December 31, 2014. Value of shares issued in exchange for ATLS common units Common stock, shares authorized (in shares) Dividend declared per share of common stock (in dollars per share) Common stock, par value (in dollars per share) Common units par value (in dollars per share) Common Stock [Member] Common Stock [Member] Common stock, shares outstanding (in shares) Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Targa Resources Corp. Total comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive income (loss) attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income attributable to Targa Resources Corp. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Noncontrolling interests Total Consolidation Items [Domain] Consolidation Items [Axis] Construction in Progress [Member] Net non-cash balance sheet movements excluded from consolidated statements of cash flows Conversion of Stock, Amount Converted Corporate and Eliminations [Member] Corporate and Other [Member] Product purchases Cost of Purchased Oil and Gas Costs and expenses: Credit Facility [Domain] Credit Facility [Axis] Crude Oil [Member] Current Current Income Tax Expense (Benefit) Designated as Hedging Instrument [Member] Tendered percentage (in hundredths) Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed Debt Instrument [Line Items] Debt additions and retirements related to exchange of TRP 6.625% Notes for APL 6.625% Notes Debt Conversion, Original Debt, Amount Debt Obligations [Abstract] Weighted Average Interest Rate Incurred (in hundredths) Debt, Weighted Average Interest Rate Schedule of Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Debt instrument, basis spread on variable rate (in hundredths) Debt Instrument [Axis] Debt Obligations Debt Disclosure [Text Block] Total debt Long-term Debt, Gross Long-term debt Debt Instrument, Fair Value Disclosure Unamortized discount Debt Instrument, Unamortized Discount Maturity date Unamortized premium Range of Interest Rates Incurred (in hundredths) Debt Instrument, Name [Domain] Aggregate principal amount Debt Instrument, Face Amount Interest rate on fixed rate debt (in hundredths) Debt Instrument, Interest Rate, Stated Percentage Range of interest rates incurred, maximum (in hundredths) Range of interest rates incurred, minimum (in hundredths) Range of interest rates and weighted average interest rate [Abstract] Deferred income taxes Deferred income tax expense (benefit) Deferred Deferred Income Tax Expense (Benefit) Deferred income taxes Deferred Tax Assets, Net of Valuation Allowance, Current Deferred income taxes Deferred Tax Liabilities, Net, Noncurrent Depreciation and amortization expense Depreciation and amortization expenses Depreciation, Depletion and Amortization Fair value of derivative contracts received as component of derivative contract settlement Derivative, Cash Received on Hedge Mark-to-market losses Derivative Instruments Not Designated as Hedging Instruments, Loss Notional volumes of commodity hedges (Bbl per day) Derivative, Nonmonetary Notional Amount, Volume Contingent Liability [Member] Derivative Financial Instruments, Liabilities [Member] Notional volumes of commodity hedges (MMBtu per day) Derivative, Nonmonetary Notional Amount, Energy Measure Pro forma net presentation, asset, noncurrent Derivative Asset, Noncurrent Derivative [Line Items] Gross liability Derivative Asset, Fair Value, Gross Liability Gain (loss) recognized in income on derivatives Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Pro forma net presentation, asset Derivative Assets (Liabilities), at Fair Value, Net Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] Pro forma net presentation, asset, current Derivative Asset, Current Derivative [Table] Derivative Instruments and Hedging Activities [Abstract] Assets from commodity derivative contracts Pro forma net presentation, asset, total Derivative Asset [Abstract] Derivative Instrument [Axis] Pro forma net presentation, liability, current Derivative Liability, Current Gross liability Gross asset Derivative Asset, Fair Value, Gross Asset Derivative, by Nature [Axis] Liabilities from commodity derivative contracts Pro forma net presentation, liability, total Pro forma net presentation, liability, noncurrent Derivative Liability, Noncurrent Derivative Liability [Abstract] Derivative financial instruments, fair value, net Derivative, Fair Value, Net Derivative, Name [Domain] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Line Items] Gain (loss) reclassified from OCI into income (effective portion) Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Derivative Contract [Domain] Gain (loss) recognized in OCI on derivatives (effective portion) Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion Hedging Relationship [Axis] Derivatives, Fair Value [Line Items] Distributions to limited partners common Distributions per limited partner unit (in dollars per unit) Date paid or to be paid Distribution Made to Limited Partner, Distribution Date Schedule of Distributions Distributions Made to Limited Partner, by Distribution [Table Text Block] Distributions declared and/or paid by the Partnership [Abstract] Distributions Declared [Member] Dividend Declared [Member] Date paid or to be paid Distributions Paid [Member] Accrued dividends Dividends Payable, Current Dividends Payable [Table] Dividends [Domain] Dividends [Axis] Dividends Payable [Line Items] Distributions Declared and/or Paid Dividends Declared [Table Text Block] Reductions in Owner's Equity related to accrued dividends on unvested equity awards under share compensation arrangements Dividends Payable Total dividend declared Dividends, Common Stock, Cash Dividends Dividends Amount Tendered and Paid Payments for notes tendered and settled upon closing of merger Earnings per Common Share Earnings Per Share [Text Block] Net income available per common share - basic (in dollars per share) Earnings Per Share, Basic Net income available per common share - diluted (in dollars per share) Earnings Per Share, Diluted Earnings per Common Share [Abstract] Compensation and benefits Energy [Domain] Commodities Energy Related Inventory Energy [Axis] Revenue from External Customer [Line Items] Ownership interest (in hundredths) Equity Method Investment, Ownership Percentage Basis difference on preliminary fair values Equity Method Investment, Difference Between Carrying Amount and Underlying Equity Distributions received from unconsolidated affiliates Proceeds from Equity Method Investment, Dividends or Distributions Equity Component [Domain] Investment in Unconsolidated Affiliate [Abstract] Investment in Unconsolidated Affiliate Equity Method Investments and Joint Ventures Disclosure [Text Block] Investments in unconsolidated affiliates Beginning of period End of period Equity Method Investments Activity Related to Investment in Unconsolidated Affiliate Adjustments for Error Corrections [Axis] Error Corrections and Prior Period Adjustments Restatement [Line Items] Fair Value [Member] Balance, beginning of period Balance, end of period Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value Measurement Basis [Axis] Liability Class [Axis] Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] New Level 3 instruments Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 TPL contingent consideration (Note 4 - Business Acquisitions) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances Transfers out of Level 3 Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table] New Level 3 instruments Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 Balance, beginning of period Balance, end of period Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs TPL contingent consideration (Note 4 - Business Acquisitions) Fair Value Measurements [Abstract] Fair Value, Hierarchy [Axis] Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 Changes in fair value of financial instruments classified as Level 3 in fair value hierarchy [Roll Forward] [Roll Forward] Fair Value by Liability Class [Domain] Fair Value Measurements Fair Value Disclosures [Text Block] Fair Value Hierarchy [Domain] Fair Value, by Balance Sheet Grouping [Table] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Breakdown by Fair Value Hierarchy Category for Financial Instruments Included in Consolidated Balance Sheets Fair Value, by Balance Sheet Grouping [Table Text Block] Fair Value Measurement [Domain] Level 3 [Member] Level 1 [Member] Level 2 [Member] Fair Value, Liabilities/Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Changes in fair value of financial instruments classified as Level 3 in fair value hierarchy [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Reconciliation of the Changes in Fair Value of Financial Instruments Classified As Level 3 Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Financial Instrument [Axis] Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Estimated annual amortization expense for intangible assets [Abstract] Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Intangible assets, net Intangible assets, net 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Three Finite-Lived Intangible Assets [Line Items] Intangible assets Finite-Lived Intangible Assets, Gross Estimated useful lives Finite-Lived Intangible Asset, Useful Life 2018 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Five 2016 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2015 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Loss on debt redemptions and amendments Gain (Loss) on Repurchase of Debt Instrument Ineffectiveness gains (losses) Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net Gain on sale or disposition of assets Gain (Loss) on Disposition of Oil and Gas and Timber Property Loss on debt redemptions and amendments Gains (Losses) on Recourse Debt Gathering Systems [Member] Gas Gathering and Processing Equipment [Member] Terminaling and Storage Facilities [Member] Gas, Transmission and Distribution Equipment [Member] Commodities Total revenues Revenues Gas Gathering, Transportation, Marketing and Processing Revenue General and administrative expense General and administrative expenses General and Administrative Expense Distributions to general partner (2%) Goodwill Goodwill Goodwill and Intangible Assets Hedging Designation [Axis] Hedging Designation [Domain] Hedging Relationship [Domain] Intersegment Eliminations [Member] Managing Member or General Partner [Axis] Incentive Distribution, Recipient [Domain] Distributions to general partners (Incentive distribution rights) Equity earnings of unconsolidated affiliate Equity earnings Equity earnings (loss) Net income Net income Net income Income Statement Location [Axis] CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) [Abstract] Income before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income Statement Location [Domain] Income tax (expense) benefit: Income Tax Expense (Benefit), Continuing Operations [Abstract] Income tax expense Income tax expense total Income Tax Expense (Benefit) Income taxes paid, net of refunds Receivables and other assets Increase (Decrease) in Accounts Receivable and Other Operating Assets Accounts payable and other liabilities Changes in operating assets and liabilities, net of business acquisitions: Inventory Increase (Decrease) in Inventories Dilutive effect of unvested stock awards (in shares) Interest capitalized on major projects Interest Interest expense, net Interest expense, net Interest paid, net of capitalized interest Accrued Interest Paid Interest Paid Interest Rate Floor [Member] Interest Rate Swaps [Member] Swaps [Member] Interest Expense, Net [Member] Interest Expense [Member] Interest Rate Contracts [Member] Interest Rate Contracts [Member] Inventories Materials and supplies Inventories Inventories, Net Inventory, Net Inventories [Abstract] Common Unit Holders [Member] Investor [Member] London Interbank Offered Rate (LIBOR) [Member] Letters of credit outstanding Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Land [Member] Contingencies Legal Matters and Contingencies [Text Block] Total current liabilities Liabilities, Current Current liabilities: LIABILITIES AND OWNERS' EQUITY Liabilities and Equity [Abstract] Total liabilities and owners' equity Liabilities and Equity General partner ownership interest (in hundredths) Percentage of general partner's interest maintained (in hundredths) General partnership interest (in hundredths) Limited Partner [Member] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Expiration period for credit facility Line of Credit Facility, Expiration Period Remaining borrowing capacity Litigation Case [Domain] Litigation Case [Axis] Current Obligations of the Partnership [Abstract] Long-term Debt, Current Maturities [Abstract] Current debt Long-term [Abstract] Long-term debt Long-term Debt, Excluding Current Maturities Contingencies [Abstract] Loss Contingencies [Table] Number of public unitholders Loss Contingency, Number of Plaintiffs Loss Contingencies [Line Items] Gulf Coast Fractionators LP [Member] Majority-Owned Subsidiary, Unconsolidated [Member] Maximum [Member] Minimum [Member] Distributions to noncontrolling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Noncontrolling interests in subsidiaries NGL [Member] Natural Gas Liquids [Member] Natural Gas [Member] Natural Gas [Member] Fees from midstream services Organization Nature of Operations [Text Block] Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Cash flows from operating activities Net change in cash and cash equivalents Net Cash Provided by (Used in) Continuing Operations Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net income attributable to common shareholders Net Income (Loss) Attributable to Parent Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net income attributable to noncontrolling interests Less: Net income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Other income (expense): Number of reportable segments per division Impact of Partnership equity transactions Noncontrolling Interest, Increase from Subsidiary Equity Issuance Noncontrolling Interests [Member] Noncontrolling interest in acquired subsidiaries Sale of Partnership limited partner interests Not Designated as Hedging Instrument [Member] Offsetting Liabilities [Line Items] Offsetting Assets [Line Items] Offsetting Assets [Table] Offsetting Liabilities [Table] Operating Segments [Member] Operating Segments [Member] Income from operations Operating Income (Loss) Operating expenses Operating Costs and Expenses Basis of Presentation Basis of Presentation [Abstract] Current Liabilities from Risk Management Activities [Member] Current Position [Member] Long-Term Liabilities from Risk Management Activities [Member] Long-term Position [Member] Long-term Position [Member] Long-Term Assets from Risk Management Activities [Member] Other Noncurrent Assets [Member] Current Position [Member] Current Assets from Risk Management Activities [Member] Other Current Assets [Member] Other comprehensive income (loss) Other comprehensive income (loss), after tax Other Comprehensive Income (Loss), Net of Tax Change in fair value, after tax Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax Change in fair value, related income tax Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Other comprehensive income (loss), pre-tax Other Comprehensive Income (Loss), before Tax Change in fair value, pre-tax Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax Other comprehensive income (loss) attributable to Targa Resources Corp., related income tax Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Other long-term assets Other comprehensive income (loss), related income tax Other Comprehensive Income (Loss), Tax Other operating (income) expense Other Operating Income (Expense), Net Other Property, Plant and Equipment [Member] Other Capitalized Property Plant and Equipment [Member] Other comprehensive income (loss) Other current assets Other long-term liabilities Non-cash balance sheet movements related to business acquisition: (see Note 4 - Business Acquisitions) [Abstract] Other Noncash Investing and Financing Items [Abstract] Other Other Nonoperating Income (Expense) Other, net Other Nonrecurring (Income) Expense Change in fair value, pre-tax Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax, Portion Attributable to Parent Change in fair value, pre-tax Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax, Portion Attributable to Noncontrolling Interest Other comprehensive income (loss) attributable to noncontrolling interests, pre-tax Other Comprehensive Income (Loss), before Tax, Portion Attributable to Noncontrolling Interest Other comprehensive income (loss) attributable to noncontrolling interests, related income tax Other Comprehensive Income (Loss), Tax, Portion Attributable to Noncontrolling Interest Other Other comprehensive income (loss) attributable to Targa Resources Corp., pre-tax Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Other comprehensive income (loss) attributable to Targa Resources Corp. Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Change in fair value, related income tax Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Portion Attributable to Noncontrolling Interest Other comprehensive loss attributable to noncontrolling interests Other comprehensive income (loss) attributable to Targa Resources Corp., after tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other comprehensive income (loss) attributable to noncontrolling interests, after tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest Change in fair value, related income tax Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Portion Attributable to Parent Change in fair value, after tax Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Noncontrolling Interest Change in fair value, after tax Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent Position [Axis] Position [Domain] Products and Services [Domain] Partner Type [Axis] Partner Type of Partners' Capital Account, Name [Domain] Partnership Units and Related Matters [Abstract] Total distributions to general and limited partners Partners' Capital Account, Distributions Partnership Units and Related Matters Partners' Capital Notes Disclosure [Text Block] Net proceeds from public offering Partners' Capital Account, Public Sale of Units Net of Offering Costs Accounts Payable and Accrued Liabilities [Abstract] Repayment of term loan Payments for Loans Repurchase of common stock under TRC compensation plans Payments for Repurchase of Common Stock Other, net Payments for (Proceeds from) Other Investing Activities Dividends to common shareholders Amount of dividend paid Payments of Ordinary Dividends, Common Stock Outlays for business acquisitions, net of cash acquired Cash paid, net of cash acquired Net cash merger consideration included in investing activities Cash payments related to acquisition Cash payments related to acquisition Outlays for property, plant and equipment Payments to Acquire Property, Plant, and Equipment Costs incurred in connection with financing arrangements Payments of Debt Issuance Costs Distributions to noncontrolling interests Payments to Noncontrolling Interests Repurchase of common units under Partnership compensation plans Payments to Acquire Limited Partnership Interests Portion at Fair Value Measurement [Member] Preferred stock, par value (in dollar per share) Percentage of cumulative redeemable perpetual preferred units (in hundredths) Preferred Stock, Dividend Rate, Percentage Preferred stock ($0.001 par value, 100,000,000 shares authorized, no shares issued and outstanding) Preferred Stock, Value, Issued Preferred stock, shares issued (in shares) Preferred stock, shares authorized (in shares) Preferred stock, shares outstanding (in shares) Net losses on commodity hedges recorded in OCI that are expected to be reclassified to revenue within twelve months Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months Proceeds from accounts receivable securitization facility Return of capital from unconsolidated affiliate Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital Proceeds from borrowings under credit facilities Proceeds from Lines of Credit Proceeds from issuance of senior notes Net proceeds from issuance of senior notes Proceeds from Notes Payable Contributions from noncontrolling interests Proceeds from Noncontrolling Interests Proceeds from issuance of senior term loan Proceeds from TRC equity offerings Proceeds from Issuance of Common Stock Proceeds from sale of common units of the Partnership Products and Services [Axis] Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Property, Plant and Equipment and Intangible Assets Property, Plant and Equipment [Table Text Block] Property, Plant and Equipment by Type [Axis] Estimated useful lives Property, Plant and Equipment, Useful Life Property, Plant and Equipment, Type [Domain] Property, plant and equipment, net Property, Plant and Equipment, Net Property, plant and equipment Property, plant and equipment Property, Plant and Equipment and Intangible Assets Property, Plant, and Equipment and Intangible Assets [Text Block] Property, Plant and Equipment [Line Items] Reportable Segments [Member] Reportable Subsegments [Member] Range [Domain] Range [Axis] Reconciliation of Operating Margin to Net Income Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Processing and Fractionation Facilities [Member] Refining Equipment [Member] Related Party Transaction [Line Items] Related Party [Axis] Related Party [Axis] Related Party [Domain] Repayments of credit facilities Repayments of Lines of Credit Repayments on senior term loan Repayments of Notes Payable Repayments of accounts receivable securitization facility Repayments of Accounts Receivable Securitization Results of tender offers [Abstract] Repayment of debt Redemption of APL senior notes Restatement Adjustment [Member] Restricted Stock Units (RSUs) [Member] Retained Earnings (Accumulated Deficit) [Member] Retained Earnings [Member] Retained earnings Sale of commodities Revolving Credit Facility [Member] Subsegments Consolidation Items [Axis] Subsegments Consolidation Items [Domain] Sale of Stock [Domain] Revenues [Member] Sales [Member] Scenario, Unspecified [Domain] Preliminary Fair Value Determination Related to the Atlas Mergers Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Consideration Transferred to Acquire ATLS and APL Schedule of Business Acquisitions, by Acquisition [Table Text Block] Changes in Aggregate Asset Retirement Obligations Schedule of Asset Retirement Obligations [Table Text Block] Amounts Recorded in OCI and Amounts Reclassified from OCI to Revenue and Expense Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block] Supplemental Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Gain (Loss) Recognized in Income on Derivatives Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Earnings per Common Share Schedule of Finite-Lived Intangible Assets [Table] Deferred Gains (Losses) Included in Accumulated OCI Schedule of Accounts Payable and Accrued Liabilities Schedule of Business Acquisitions, by Acquisition [Table] Components of Inventories Schedule of Inventory, Current [Table Text Block] Revenue from External Customers by Products and Services [Table] Revenues by Product and Service Revenue from External Customers by Products and Services [Table Text Block] Schedule of Outstanding Debt Notional Volume of Commodity Hedges Schedule of Derivative Instruments [Table Text Block] Summary of Results of Tender Offers Schedule of Extinguishment of Debt [Table Text Block] Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Line Items] Schedule of Error Corrections and Prior Period Adjustment Restatement [Table] Property, Plant and Equipment [Table] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Segment Reporting Information, by Segment [Table] Information by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Fair Values of Derivative Instruments Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Schedule of Stock by Class [Table] Segment Information [Abstract] Segment [Domain] Segment Reporting Information [Line Items] Other financial information [Abstract] Segment Information Segment Reporting Disclosure [Text Block] Outstanding Note Balance Note Balance after Tender Offers Aggregate principal amount outstanding Senior Notes Class E Preferred Units [Member] Vesting period of original term Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Cash payment representing accelerated vesting of a portion of employees APL phantom awards Compensation on equity grants Share-based Compensation Common stock closing market price (in dollars per share) Equity Award [Domain] Common stock issued price per share (in dollars per share) Balance (in shares) Balance (in shares) Shares, Outstanding Common stock and Partnership units tendered for tax withholding obligations (in shares) Significant Accounting Policies Significant Accounting Policies [Text Block] Statement [Line Items] CONSOLIDATED STATEMENTS OF CHANGES IN OWNERS' EQUITY (Unaudited) [Abstract] CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) [Abstract] CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) [Abstract] Equity Components [Axis] Statement [Table] Scenario [Axis] Segments [Axis] CONSOLIDATED BALANCE SHEETS (Unaudited) [Abstract] Class of Stock [Axis] Common stock issued in ATLS merger Repurchase of common stock Stock Repurchased During Period, Value Number of additional shares sold in public offering (in shares) Proceeds from equity issuances Common stock net proceeds of public offering Proceeds from equity issuances (in shares) Number of shares issued in public offering (in shares) Common stock issued in ATLS merger (in shares) Compensation on equity grants Shares issued under compensation program Shares issued under compensation program (in shares) Additional net proceeds from public offering pursuant to exercise of underwriters' overallotment option Stock Issued During Period, Value, Other Repurchase of common stock (in shares) Owners' equity: Targa Resources Corp. stockholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Balance Balance Total owners' equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total Targa Resources Corp. stockholders' equity Stockholders' Equity Attributable to Parent Subsequent Event Type [Axis] Subsequent Event [Member] Subsequent Event Type [Domain] Sale of Stock [Axis] Supplemental Cash Flow Information [Abstract] Income and other taxes Financial Instruments [Domain] Transportation Assets [Member] Transportation Equipment [Member] Treasury stock, shares (in shares) Treasury Shares [Member] Treasury Stock [Member] Treasury stock, at cost (411,815 shares as of June 30, 2015 and 388,890 as of December 31, 2014) Treasury Stock, Value Unamortized debt issuance costs Risk management activities Unrealized Gain (Loss) on Derivatives Partnership's Senior Unsecured Notes [Member] Senior Unsecured Notes [Member] Unsecured Debt [Member] Vesting [Domain] Vesting [Axis] Variable Rate [Axis] Variable Rate [Domain] Weighted average shares outstanding - basic (in shares) Weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Weighted average shares outstanding - diluted (in shares) Weighted average shares outstanding - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Write off of debt issuance cost Write off of Deferred Debt Issuance Cost The cash outflow to repay loan facilities for the non Partnership. Repayments of Loan Facilities For Non Partnership Repayments of credit facility The cash inflow from the borrowing of loan facilities for the non Partnership. Proceeds From Borrowings of Loan Facilities For Non Partnership Proceeds from borrowings under credit facility Loan Facilities Of Partnership [Abstract] Partnership debt obligations: Reconciliation of operating margin to net income [Abstract] Revenues reduced by product purchases and operating expenses. Operating Margin Operating margin Senior unsecured notes due 2023 Senior unsecured notes due 2023 [Member] Senior Unsecured 5 7/8% Notes due August 2023 [Member] Senior unsecured notes due October 2020. Senior Unsecured Notes Due 2020 [Member] Senior Unsecured 6 5/8% Notes due October 2020 [Member] Amount paid for premium on extinguishment of debt. Debt Instrument, Premium Paid on Extinguishment of Debt Premium Paid Amount of tender offer payments which includes principal, premium and accrued interest payments. Debt Instrument, Tender Offer payments Total Tender Offer payments Total tender offer payments Refers to the business acquisition, acquiree entity Atlas Pipeline Partners, L.P. acquisition. Atlas Pipeline Partners, L.P. Acquisition [Member] Atlas Pipeline Partners [Member] Represents information related to APL senior notes tender offers. Senior Notes Tender Offers [Member] APL Senior Notes Tender Offers [Member] Represents information related to APL senior notes with offers tendered. Senior Notes with Offers Tendered [Member] APL Senior Notes with Offers Tendered [Member] Senior unsecured notes due November 2021. Senior Unsecured Notes Due 2021 [Member] Senior Unsecured 4 3/4% Notes due November 2021 [Member] Another company which is controlled, directly or indirectly, by its parent. The usual condition for control is ownership of a majority (over 50%) of the outstanding voting stock. The power to control may also exist with a lesser percentage of ownership, for example, by contract, lease, agreement with other stockholders or by court decree. Targa Resources Partners LP [Member] Targa Resources Partners LP [Member] Targa Resources Partners LP [Member] Refers to the partnership's senior secured credit facility. Partnership's Senior secured credit facility [Member] Partnership's Senior Secured Revolving Credit Facility [Member] TRP Senior Secured Revolving Credit Facility due 2017 [Member] TRC Senior secured revolving credit facility, variable rate, due February 2020. Trc Senior Secured Revolving Credit Facility Due 2020 [Member] TRC Senior Secured Revolving Credit Facility due February 2020 [Member] Senior unsecured notes due February 2021. Senior Notes Due 2021 [Member] Senior Unsecured 6 7/8% Notes due February 2021 [Member] Refers to the senior secured term loan. Senior Secured Term Loan [Member] Senior Secured Term Loan [Member] Senior unsecured notes due August 2022. Senior Unsecured Notes due August 2022 [Member] Senior Unsecured 6 3/8% Notes due August 2022 [Member] Represents to the senior secured credit facility. Senior Secured Credit Facility [Member] TRC Senior secured term loan, due February 2022. Trc Senior Secured Term Loan Due 2022 [Member] TRC Senior Secured Term Loan due February 2022 [Member] Senior unsecured notes due May 2023. Senior Unsecured Notes Due May 2023 [Member] Senior Unsecured 5 1/4% Notes due May 2023 [Member] Senior unsecured notes due November 2019. Senior Unsecured Notes Due 2019 [Member] Senior Unsecured 4 1/8% notes due November 2019 [Member] TRC Senior secured revolving credit facility due 2017. TRC Senior Secured Revolving Credit Facility due 2017 [Member] TRC Senior Secured Revolving Credit Facility [Member] Financing through issuance of security instrument that represents a creditor relationship with the holder of the investment security related to accounts receivable securitization facility due in December 2015. Accounts Receivable Securitization Facility Due December 2015 [Member] Accounts Receivable Securitization Facility due December 2015 [Member] Senior unsecured notes due January 2018. Senior Notes Due 2018 [Member] Senior Unsecured 5% Notes due January 2018 [Member] Senior unsecured notes due November 2023. Senior Unsecured Notes due November 2023 [Member] Senior Unsecured 4 1/4% Notes due November 2023 [Member] Financing through issuance of security instrument that represents a creditor relationship with the holder of the investment security related to Accounts Receivable securitization facility. Accounts receivable securitization facility [Member] Accounts Receivable Securitization Facility [Member] A provider of natural gas gathering, processing and treating services primarily in the Anadarko, Arkoma and Permian Basins located in the southwestern and mid-continent regions of the United States and in the Eagle Ford Shale play in south Texas. Targa Pipeline Partners LP [Member] This line item represents the number of natural gas basis swaps categorized as Level 3 by the entity. Number of natural gas basis swaps categorized as Level 3 Fair value as of the balance sheet date of the assets less the liabilities of a derivative or group of derivatives if the commodity price increases by 10 percent. Derivative Fair Value of Asset (Liability), Net If Commodity Price Increases by 10 Percent Derivative fair value of net asset if commodity price increases by 10 percent Financial Instruments Recorded on Our Consolidated Balance Sheets at Fair Value [Abstract] Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract] Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value [Abstract] Refers to the partnership's accounts receivable securitization facility. Partnership's accounts receivable securitization facility [Member] Partnership's Accounts Receivable Securitization Facility [Member] Fair value as of the balance sheet date of the assets less the liabilities of a derivative or group of derivatives if the commodity price decreases by 10 percent. Derivative Fair Value of Asset (Liability), Net If Commodity Price Decreases by 10 Percent Derivative fair value of net asset if commodity price decreases by 10 percent Contributions from non controlling interest received during the period. Contributions from non controlling interest Contributions from noncontrolling interests The equity impact of the accrual of distribution equivalent rights during the period. Accrual of distribution equivalent rights Accrual of distribution equivalent rights Increase in noncontrolling interest balance because of issuance of Partnership units during the period. Noncontrolling Interest, Increase from Issuance of Partnership Units Issuance of Partnership units in APL merger Number of shares granted, before forfeitures, of stock or other type of equity granted of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Compensation on equity grants (in shares) Fair value, before the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Derivative Liability, Before Effects of Master Netting Arrangements, Noncurrent Long-term liabilities from risk management activities Fair value, before the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Derivative Asset, Before Effects of Master Netting Arrangements, Noncurrent Long-term assets from risk management activities Fair value, before the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Derivative Asset, Before Effects of Master Netting Arrangements, Current Assets from risk management activities Fair value, before the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Derivative Liability, Before Effects of Master Netting Arrangements, Current Liabilities from risk management activities Property, Plant and Equipment and Intangible Assets [Abstract] A component of an enterprise pertaining to Non-Partnership. TRC Non Partnership [Member] TRC Non-Partnership [Member] This element represents the amortization period of acquired intangible assets used for the purpose of preparing the financial statements. Amortization Period of Acquired Intangible Assets Used For Purpose of Preparing Financial Statements Amortization period of acquired intangible assets used for preparing financial statements Fair value, before the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Derivative Asset, Before Effects of Master Netting Arrangements Gross asset Derivative assets Counterparties without offsetting position that participate in a financial transaction. Counterparties without Offsetting Position [Member] Counterparties without Offsetting Position [Member] Counterparties with offsetting position that participate in a financial transaction. Counterparties with Offsetting Position [Member] Counterparties with Offsetting Position [Member] Refers to deferred gains (losses) included in accumulated other comprehensive income, before tax. Deferred Gains (Losses) in Accumulated OCI, Before Tax Deferred gains (losses) included in accumulated OCI, before tax The caption reflecting income (expense) not reported elsewhere. Other Income (Expense) [Member] Other Income (Expense) [Member] Fair value, before the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Derivative Liability, Before Effects of Master Netting Arrangements Derivative liabilities Gross liability Commodity hedging contracts, attributable to Parent [Abstract] Commodity hedging contracts: Amount after tax of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income, attributable to parent entity. Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income, Net of Tax, Portion Attributable to Parent Settlements reclassified to revenues, after tax Interest Rate Swaps, Attributable to Parent [Abstract] Interest rate swaps: Amount after tax for income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net interest expense, attributable to parent entity. Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Interest, Net of Tax, Portion Attributable to Parent Settlements reclassified to interest expense, net, after tax Income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net interest expense attributable to parent entity. Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Interest, Portion Attributable to Parent Settlements reclassified to interest expense, net, pre-tax Before tax amount of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income, attributable to parent entity. Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income, Before Tax, Portion Attributable to Parent Settlements reclassified to revenues, pre-tax Amount of tax (expense) benefit income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net interest expense, attributable to parent entity. Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Interest, Tax, Portion Attributable to Parent Settlements reclassified to interest expense, net, related income tax Interest rate swaps, attributable to noncontrolling interests [Abstract] Interest rate swaps: Amount of tax (expense) benefit income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net interest expense attributable to noncontrolling interest. Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Interest, Tax, Portion Attributable To Noncontrolling Interest Settlements reclassified to interest expense, net, related income tax Amount after tax for income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net interest expense attributable to noncontrolling interest. Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Interest, Net of Tax, Portion Attributable To Noncontrolling Interest Settlements reclassified to interest expense, net, after tax Income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net interest expense attributable to noncontrolling interest. Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Interest, Portion Attributable To Noncontrolling Interest Settlements reclassified to interest expense, net, pre-tax Amount of tax (expense) benefit of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income, attributable to parent entity. Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income, Tax, Portion Attributable to Parent Settlements reclassified to revenues, related income tax Commodity hedging contracts, attributable to noncontrolling interests [Abstract] Commodity hedging contracts: Amount after tax of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income, attributable to noncontrolling interest. Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income, Net of Tax, Portion Attributable To Noncontrolling Interest Settlements reclassified to revenues, after tax Before tax amount of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income, attributable to noncontrolling interest. Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income, Portion Attributable To Noncontrolling Interest Settlements reclassified to revenues, pre-tax Amount of tax (expense) benefit of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income, attributable to noncontrolling interest. Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income, Tax, Portion Attributable To Noncontrolling Interest Settlements reclassified to revenues, related income tax Interest rate swaps, including portion attributable to noncontrolling interests [Abstract] Interest rate swap: Commodity hedging contracts, including portion attributable to noncontrolling interests [Abstract] Commodity hedging contracts: Amount after tax of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income, including portion attributable to noncontrolling interest. Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income, Net of Tax, Including Portion Attributable To Noncontrolling Interest Settlements reclassified to revenues, after tax Amount of tax (expense) benefit of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income, including portion attributable to noncontrolling interest. Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income, Tax, Including Portion Attributable To Noncontrolling Interest Settlements reclassified to revenues, related income tax Before tax amount of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income, including portion attributable to noncontrolling interest. Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income, Before Tax, Including Portion Attributable To Noncontrolling Interest Settlements reclassified to revenues, pre-tax Amount of tax (expense) benefit income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net interest expense, including portion attributable to noncontrolling interest. Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Interest, Tax, Including Portion Attributable To Noncontrolling Interest Settlements reclassified to interest expense, net, related income tax Income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net interest expense, including portion attributable to noncontrolling interest. Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Interest, Before Tax, Including Portion Attributable To Noncontrolling Interest Settlements reclassified to interest expense, net, pre-tax Amount after tax for income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net interest expense, including portion attributable to noncontrolling interest. Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Interest, Net of Tax, Including Portion Attributable To Noncontrolling Interest Settlements reclassified to interest expense, net, after tax A component of an enterprise pertaining to gathering and processing fees. Gathering and processing fees [Member] Gathering and Processing [Member] A component of an enterprise pertaining to petroleum products. Petroleum Products [Member] Petroleum Products [Member] A component of an enterprise pertaining to condensate sales. Condensate sales [Member] Condensate [Member] A component of an enterprise pertaining to NGL sales. NGL sales [Member] NGL [Member] A component of an enterprise pertaining to storage, terminaling. transportation and export fees. Storage, Terminaling, Transportation and Export Fees [Member] Storage, Terminaling, Transportation and Export [Member] A component of an enterprise pertaining to derivative activities. Derivative activities [Member] Derivative Activities [Member] Other midstream services fees not included in the other categories. Midstream Services, Other [Member] Other [Member] A component of an enterprise pertaining to fractionating and treating fees. Fractionating and treating fees [Member] Fractionating and Treating [Member] Loan Facilities Of Non Partnership [Abstract] Non-Partnership debt obligations: A component of an enterprise pertaining to natural gas sales. Natural gas sales [Member] Natural Gas [Member] Tabular disclosure of pro forma impact of derivatives net in the Consolidated Balance Sheet. Pro forma impact of derivatives net in Consolidated Balance Sheet [Table Text Block] Pro Forma Impact of Derivatives Net In Consolidated Balance Sheet Refers to the fair value of joint ventures acquired during the period. Fair Value of Joint Ventures Acquired During Period Preliminary fair value of T2 Joint Ventures acquired The estimated periods of time over which underlying assets amortized on a straight-line basis. Equity Method Investment Estimated Useful Lives Of Underlying Assets Preliminary estimated useful lives of the underlying assets Represents the number of non-operated joint ventures acquired in Atlas mergers. Number of Non Operated Joint Ventures Number of non-operated joint ventures acquired in Atlas mergers Cash call for expansion projects. Cash call for expansion projects Cash calls for expansion projects Represents T2 EF Co-Gen, one of the non-operated joint ventures. T2 EF Co-Gen [Member] Represents T2 LaSalle, one of the non-operated joint ventures. T2 LaSalle [Member] Represents T2 Eagle Ford, one of the non-operated joint ventures. T2 Eagle Ford [Member] Partnership Ownership Disclosure [Abstract] Number of common units of Targa Resources Partners LP owned by the Company. Number Of Partnership Common Units Owned Number of Partnership common units owned (in units) This element represents the general partner ownership interest by parent. General Partner Ownership Interest by Parent Parent's percentage ownership in the general partner of the Partnership The amount of common units and replacement equity awards that an entity acquires in a noncash (or part noncash) acquisition. Non cash merger consideration common units and replacement equity awards Non-cash merger consideration - common units and replacement equity awards Cash [Abstract] Non cash adjustment to line-fill. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. Non-cash adjustment to line-fill Deadstock commodity inventories transferred to property, plant and equipment Amount of materials and supplies transferred to property, plant and equipment in a noncash transactions. Transfers from materials and supplies to property, plant and equipment Transfers from materials and supplies inventory to property, plant and equipment Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer. Business Combination, Consideration Transferred, Excluding Liabilities Assumed Total fair value of consideration transferred The amount of common shares and replacement equity awards that an entity acquires in a noncash (or part noncash) acquisition. Non cash merger consideration common shares and replacement equity awards Non-cash merger consideration - common shares and replacement equity awards Number of divisions in which the entity reports its operations. Number of Divisions Number of divisions The division is also referred to as its Downstream Business. The Partnership's Downstream Business includes all the activities necessary to convert mixed NGLs into NGL products and provides certain value added services such as storing, terminaling, distributing and marketing of NGLs, refined petroleum products and crude oil. It also includes certain natural gas supply and marketing activities in support of the Partnership's other operations, as well as transporting natural gas and NGLs. Logistics and Marketing [Member] Logistics and Marketing [Member] A component of an enterprise pertaining to Marketing and Distribution. Marketing and Distribution [Member] Marketing and Distribution [Member] Assets used in the gathering of natural gas produced from oil and gas wells and processing this raw natural gas into merchantable natural gas by extracting NGLs and removing impurities. Gathering and Processing [Member] Gathering and Processing [Member] A component of an enterprise pertaining to field gathering and processing. Field Gathering and Processing [Member] Field Gathering and Processing [Member] A component of an enterprise pertaining to Logistics Assets. Logistics Assets [Member] Logistics Assets [Member] A component of an enterprise pertaining to coastal gathering and processing. Coastal Gathering and Processing [Member] Coastal Gathering and Processing [Member] Refers to the special general partner interest. Special General Partner Interest [Member] Special GP Interest [Member] Total capital expenditures for additions to long-lived assets. Segment Reporting Information Capital Expenditures Capital expenditures Disclosure of accounting policy for updates to all significant accounting policies of the reporting entity. Accounting Policy Updates [Policy Text Block] Accounting Policy Updates Document and Entity Information [Abstract] A putative class action lawsuits filed against APL, ATLS, Atlas Pipeline Partners GP, LLC, the general partner of APL ("APL GP"), its managers, TRC, the Partnership, the general partner and Trident MLP Merger Sub LLC (the "APL Lawsuit Defendants"). Atlas Unitholder Litigation [Member] Refers to the business acquisition, acquiree entity Atlas Energy, L.P. acquisition. Atlas Energy, L.P. Acquisition [Member] Atlas Energy [Member] Year in which the derivative expires. Derivative Expiration Year [Axis] Derivative Expiration Year [Axis] The year the derivative expires. Derivative Expiration Year [Domain] Derivative Expiration Year [Domain] Derivatives expiring in four years in the future. Year Four [Member] Year 2018 [Member] Derivatives expiring in one year in the future. Year One [Member] Year 2015 [Member] Derivatives expiring in two years in the future. Year Two [Member] Year 2016 [Member] Derivatives expiring in three years in the future. Year Three [Member] Year 2017 [Member] Financial contract between two parties, the buyer and the seller of the option, where the buyer has the right but not the obligation to buy an agreed quantity of a particular commodity or financial instrument (the underlying instrument) from the seller of the option for a certain price (the strike price). Seller is obligated to sell the asset to the buyer, if the buyer exercises the option. And the average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract. Call Option and Collars [Member] Option/Collars [Member] The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract. Collars [Member] Collars [Member] Condensate product hedged against price risk. Condensate [Member] Condensate [Member] Refers to phantom unit awards that is subordinate to all other stock of the issuer. Phantom Unit Awards [Member] Refers to sale of equity interest percentage. Business Acquisition Sale of equity interest percentage Percentage of equity interest sold (in hundredths) Refers to entity Atlas Resource Partners, L.P. Atlas Resource Partners, LP [Member] Atlas Resource Partners, LP [Member] Refers to entity West Texas LPG Pipeline Limited Partnership. West Texas LPG Pipeline Limited Partnership [Member] West Texas LPG Pipeline Limited Partnership [Member] Partnership [Abstract] Partnership: Refers to vesting percentage original term. Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments vesting percentage original term Vesting percentage original term (in hundredths) Refers to period of dividend payment. Dividend Payment Period Dividend payment period Refers to vesting term under condition two. Vesting Term Two [Member] Vesting Term Two [Member] Refers to vesting term under condition three. Vesting Term Three [Member] Vesting Term Three [Member] Refers to vesting term under condition one. Vesting Term One [Member] Vesting Term One [Member] Number of common units into which each replacement equity unit may be converted. Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Number Of Common Units Called By Replacement Equity Unit Number of common units called by replacement equity unit (in shares) Organization [Abstract] Refers to gross amount of current receivables expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date. Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Other Current Receivables Contractual receivables included in current receivables Refers to gross amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Gross Contractual receivables included in other long term assets Refers to the amount of equity method investments recognized as of the acquisition date. Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Equity Method Investments Investments in unconsolidated affiliates Refers to gross amount due from contracts expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Gross Trade receivables, gross amount An adjustments to the provisional acquisition date fair values due to the refinement of valuation models, assumptions and inputs. Measurement Period Adjustments [Member] Schedule that describes and identifies accounts payable and accrued liabilities at the end of the reporting period. Accounts Payable and Accrued Liabilities [Table] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Accounts Payable and Accrued Liabilities [Line Items] Refers to the payment related to the change of control payments in association with the business acquisition. Change Of Control Payments [Member] Change Of Control Payments [Member] Refers to settlement of equity award. Equity Award Settlements [Member] Equity Award Settlements [Member] Incentive distribution payments made to members in year four. Incentive Distribution Rights Year Four [Member] Distribution Rights Year 4 [Member] Incentive distribution payments made to members in year three. Incentive Distribution Rights Year Three [Member] Distribution Rights Year 3 [Member] Incentive distribution payments made to members in year one. Incentive Distribution Rights Year One [Member] Distribution Rights Year 1 [Member] Incentive distribution payments made to members in year two. Incentive Distribution Rights Year Two [Member] Distribution Rights Year 2 [Member] The amount of capital contributed by the general partner during the period to maintain general partner ownership. General partner, amount contributed to maintain general partner ownership percentage Amount contributed to maintain general partner ownership percentage Payments to capital contribution in partnership The increase (decrease) on quarterly basis in incentive distribution. Increase (Decrease) in Incentive Distribution Reduction in incentive distribution Number of successive quarters in which annual distribution is paid. Number of successive quarters, annual distribution is paid Number of successive quarters, annual distribution is paid Refers to the increase (decrease) in amount of consideration transferred in a business acquisition. Business Acquisition Consideration Transferred, Increase (Decrease) Reduction in purchase price Refers to the cash payment related to one-time cash payments and cash settlements of equity awards in association with the business acquisition. Business Acquisition, Cash Payment Related to One-time Cash Payments and Cash Settlements of Equity Awards Cash payment related to one-time cash payments and cash settlements of equity awards Refers to the length of pipelines. Length of Pipelines Length of additional pipelines (in miles) The percentage of ownership interest in common stock of spin-off entity. Ownership Percentage in Spin-off Entity Percentage of interest in common units (in hundredths) Refers to the number of legal transactions involved in mergers. Number of legal transactions involved in mergers Number of separate legal transactions involved in mergers The cash payment paid for each unit holder of the acquiree. Business Acquisition Cash Payment Per Unit Cash payment (in dollars per common unit) Refers to common units owned by parent immediately prior to closing. Business Acquisition Equity Interests Owned by Parent Prior To Closing Common units owned by parent prior to closing (in units) Refers to the entity acquired in a business combination. Atlas Energy [Member] Refers to the cash payment cash payment in lieu of unit issuances for certain employees in association with the business acquisition. Business Acquisition, Cash Payment In Lieu Of Unit Issuances Cash paid in lieu of unit issuances Number of shares of equity interests issued or issuable for each common unit to acquire entity. Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Per Unit Distribution of common units/shares for each common unit (in shares) Refers to the processing capacity of gas plants. Processing Capacity of Gas Plants Processing capacity (in MMcf/D) Tabular disclosure of the range of interest rates and weighted average interest rate incurred on variable rate debt obligations for the period. Schedule Of Range Of Interest Rates And Weighted Average Interest Rate Incurred On Variable Rate Debt Obligations [Table Text Block] Interest Rates Incurred on Variable-Rate Debt Obligations Floor on interest rate for funds borrowed, under the debt agreement. Debt Instrument, Interest Rate, Floor Rate Debt instrument, floor interest rate (in hundredths) Write-off of amounts previously capitalized as debt discount in an extinguishment of debt. Write off of Unamortized Debt Discount Write off of debt discount The additional commitment increase under the credit facility available upon request. Line of credit, Additional commitment increase available upon request Additional commitment increase available upon request The aggregate amount of debt or equity securities allowed to be issued under the shelf agreement filed with the Securities and Exchange Commission. Aggregate Amount Of Debt Or Equity Securities Allowed Under Shelf Agreement Aggregate amount of debt or equity securities allowed under shelf agreement Represents the rate of discount on debt issued. Debt Instrument Discount Rate Debt instrument discount rate (in hundredths) Refers to the cash payment related to the change of control payments in association with the business acquisition. Business Acquisition, Cash Payment Related to Change of Control Payments Cash payments related to change of control payments Agreement includes lender from time to time party thereto and Bank of America, N.A. as administrative agent, collateral agent, swing line lender and letter of credit issuer. TRC Credit Agreement [Member] First Amendment that amended its Second Amended and Restated Credit Agreement (the "Original Agreement"). First Amendment [Member] Refers to the Second Amended and Restated Credit Agreement the Partnership entered into. Original Agreement [Member] Information on the universal shelf registration statement filed with the Securities and Exchange Commission in April 2015. Shelf Offering April 2015 Shelf [Member] The amount of capital contributed by the general partner during the subsequent reporting period to maintain ownership percentage related to the reporting period. General Partner Amount Contributed To Maintain General Partner Ownership Percentage 2 Amount contributed subsequent to the reporting period to maintain general partner ownership percentage related to the reporting period Partnership Equity [Abstract] Partnership Equity [Abstract] The net proceeds from the issuance of common limited partners units during the period. Net Proceeds From Issuance Of Common Limited Partners Units Proceeds from public offering, net of commissions Maximum percentage of obligations for sales commissions. Maximum Sales Commission Commissions to sales agents, maximum (in hundredths) The amount of common units able to be sold from an Equity Distribution Agreement. Dollar Amount Of Common Units Able To Sell From Equity Distribution Agreement Dollar amount of common units able to sell from equity distribution agreement Equity Distribution Agreement with Barclays Capital Inc., Citigroup, Deutsche Bank, Jefferies LLC, Morgan Stanley & Co. LLC, Raymond James, RBC Capital Markets, LLC, UBS and Wells Fargo Securities, LLC, as its sales agents for sales of common units under the July 2013 Shelf. Two Thousand Fifteen May Equity Distribution Agreement [Member] May 2015 EDA [Member] Equity Distribution Agreement with Barclays Capital Inc., Citigroup, Deutsche Bank, Jefferies LLC, Morgan Stanley & Co. LLC, Raymond James, RBC Capital Markets, LLC, UBS and Wells Fargo Securities, LLC, as its sales agents for sales of common units under the July 2013 Shelf. Two Thousand Fourteen May Equity Distribution Agreement [Member] May 2014 EDA [Member] Element represent the aggregate offering amount remained available for sale as of a particular date. Aggregate offering amount remained available for sale pursuant to agreement Amount which remain available under the shelf agreement The entire disclosure for common stock and related matters. Common Stock and Related Matters [Text Block] Common Stock and Related Matters Number of shares of stock issued in exchange for shares of acquiree during the period pursuant to acquisitions. Stock Issued During Period, Shares, Acquisitions, In Exchange for Shares of Acquiree Number of shares issued in exchange for ATLS common units (in shares) Number of restricted stock units replacement awarded in connection with a merger. Replacement Restricted Stock Units Replacement restricted stock units (in shares) Distribution of earnings in the form of cash, property or capital stock declared by the board of directors to be distributed to shareholders declared in Q2 2015. Dividend Declared Q2 2015 [Member] Dividend Declared, Q2 2015 [Member] Distribution of earnings in the form of cash, property or capital stock declared by the board of directors to be distributed to shareholders declared in Q1 2015. Dividend Declared, Q1 2015 [Member] Dividend Declared, Q1 2015 [Member] Distribution of earnings in the form of cash, property or capital stock declared by the board of directors to be distributed to shareholders declared in Q4 2014. Dividend Declared, Q4 2014 [Member] Dividend Declared, Q4 2014 [Member] Represents the number of days from end of each quarter by when cash is distributed to unit holders. Number of days from end of each quarter by when cash is distributed to unit holders Number of days from end of each quarter by when cash is distributed to unit holders The dividend or other distribution in cash to parent that is recorded as a decrease in equity. Dividend Or Distribution To Parent Distributions to Targa Resources Corp.