Entity Central Index Key Deemed preferred stock dividend. Revenues reduced by product purchases and operating expenses. Other operating and non operating income expense net. Document and Entity Information [Abstract] Document And Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date 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. 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. 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. Debt current net of issuance cost. 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. Statement Of Financial Position [Abstract] Statement [Table] Statement [Table] Class of Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Series A Preferred Stock [Member] Series A Preferred Stock [Member] Statement [Line Items] Statement [Line Items] ASSETS Assets [Abstract] Current assets: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Trade receivables, net of allowances of $0.0 and $0.1 million at June 30, 2018 and December 31, 2017 Accounts Receivable Net Current Inventories Inventory Net Assets from risk management activities Derivative Asset Before Effects Of Master Netting Arrangements Current Other current assets Other Assets Current Total current assets Assets Current Property, plant and equipment Property Plant And Equipment Gross Accumulated depreciation Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Property, plant and equipment, net Property Plant And Equipment Net Intangible assets, net Finite Lived Intangible Assets Net Goodwill, net Goodwill Long-term assets from risk management activities Derivative Asset Before Effects Of Master Netting Arrangements Noncurrent Investments in unconsolidated affiliates Equity Method Investments Other long-term assets Other Assets Noncurrent Total assets Assets LIABILITIES, SERIES A PREFERRED STOCK AND OWNERS' EQUITY Liabilities And Stockholders Equity [Abstract] Current liabilities: Liabilities Current [Abstract] Accounts payable and accrued liabilities Accounts Payable And Accrued Liabilities Current Liabilities from risk management activities Derivative Liability Before Effects Of Master Netting Arrangements Current Current debt obligations Debt Current Net Of Issuance Cost Total current liabilities Liabilities Current Long-term debt Long Term Debt Noncurrent Long-term liabilities from risk management activities Derivative Liability Before Effects Of Master Netting Arrangements Noncurrent Deferred income taxes, net Deferred Tax Liabilities Noncurrent Other long-term liabilities Other Liabilities Noncurrent Contingencies (see Note 18) Commitments And Contingencies Series A Preferred 9.5% Stock, $1,000 per share liquidation preference, (1,200,000 shares authorized, issued and outstanding 965,100 shares), net of discount (see Note 11) Temporary Equity Carrying Amount Attributable To Parent Owners' equity: Stockholders Equity Including Portion Attributable To Noncontrolling Interest [Abstract] Targa Resources Corp. stockholders' equity: Stockholders Equity [Abstract] Common stock value Common Stock Value Outstanding Preferred stock ($0.001 par value, after designation of Series A Preferred Stock: 98,800,000 shares authorized, no shares issued and outstanding) Preferred Stock Value Additional paid-in capital Additional Paid In Capital Retained earnings (deficit) Retained Earnings Accumulated Deficit Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income Loss Net Of Tax Treasury stock, at cost (640,033 shares as of June 30, 2018 and 585,640 shares as of December 31, 2017) Treasury Stock Value Total Targa Resources Corp. stockholders' equity Stockholders Equity Noncontrolling interests in subsidiaries Minority Interest Total owners' equity Stockholders Equity Including Portion Attributable To Noncontrolling Interest Total liabilities, Series A Preferred Stock and owners' equity Liabilities And Stockholders Equity The rate of liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. Trade receivables, allowances Allowance For Doubtful Accounts Receivable Current Preferred Series A Liquidation Stock Percentage Temporary Equity Liquidation Preference Percentage Preferred Stock, Liquidation Preference Per Share Temporary Equity Liquidation Preference Per Share Preferred Stock, Shares Authorized Temporary Equity Shares Authorized Preferred Stock, Shares Issued Temporary Equity Shares Issued Preferred Stock, Shares Outstanding Temporary Equity Shares Outstanding Common stock, par value (in dollars per share) Common Stock Par Or Stated Value Per Share Common stock, shares authorized (in shares) Common Stock Shares Authorized Common stock, shares issued (in shares) Common Stock Shares Issued Common stock, shares outstanding (in shares) Common Stock Shares Outstanding Preferred stock, par value (in dollar per share) Preferred Stock Par Or Stated Value Per Share Preferred stock, shares authorized (in shares) Preferred Stock Shares Authorized Preferred stock, shares issued (in shares) Preferred Stock Shares Issued Preferred stock, shares outstanding (in shares) Preferred Stock Shares Outstanding Treasury stock, shares (in shares) Treasury Stock Shares Income Statement [Abstract] Revenues: Revenues [Abstract] Sales of commodities (see Note 3) Oil And Gas Sales Revenue Fees from midstream services (see Note 3) Natural Gas Midstream Revenue Total revenues Gas Gathering Transportation Marketing And Processing Revenue Costs and expenses: Costs And Expenses [Abstract] Product purchases (see Note 3) Cost Of Purchased Oil And Gas Operating expenses Operating Costs And Expenses Depreciation and amortization expense Depreciation Depletion And Amortization General and administrative expense General And Administrative Expense Other operating (income) expense Other Operating Income Expense Net Income (loss) from operations Operating Income Loss Other income (expense): Nonoperating Income Expense [Abstract] Interest income (expense), net Interest Income Expense Nonoperating Net Equity earnings (loss) Income Loss From Equity Method Investments Gain (loss) from financing activities Gain Loss On Repurchase Of Debt Instrument Change in contingent considerations Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 Other, net Other Nonoperating Income Expense Income (loss) before income taxes Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Income tax (expense) benefit Income Tax Expense Benefit Net income (loss) Profit Loss Less: Net income (loss) attributable to noncontrolling interests Net Income Loss Attributable To Noncontrolling Interest Net income (loss) attributable to Targa Resources Corp. Net Income Loss Dividends on Series A Preferred Stock Dividends Preferred Stock Deemed dividends on Series A Preferred Stock Deemed Preferred Stock Dividend Net income (loss) attributable to common shareholders Net Income Loss Available To Common Stockholders Basic Net income (loss) per common share - basic Earnings Per Share Basic Net income (loss) per common share - diluted Earnings Per Share Diluted Weighted average shares outstanding - basic Weighted Average Number Of Shares Outstanding Basic Weighted average shares outstanding - diluted Weighted Average Number Of Diluted Shares Outstanding Dividends per common share declared for the period Common Stock Dividends Per Share Declared Comprehensive Income Net Of Tax [Abstract] Derivative Instrument Derivative Instrument Risk [Axis] Derivative Contract Derivative Contract Type [Domain] Commodity Contracts [Member] Commodity Contract [Member] Net income (loss) Commodity hedging contracts: Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] Change in fair value, pre-tax Other Comprehensive Income Loss Derivatives Qualifying As Hedges Before Tax Change in fair value, related income tax Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax Change in fair value, after tax Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax Settlements reclassified to revenues, pre-tax Other Comprehensive Income Loss Reclassification Adjustment From A O C I On Derivatives Before Tax Settlements reclassified to revenues, related income tax Other Comprehensive Income Loss Reclassification Adjustment From A O C I On Derivatives Tax Settlements reclassified to revenues, after tax Other Comprehensive Income Loss Reclassification Adjustment From A O C I On Derivatives Net Of Tax Other comprehensive income (loss), pre-tax Other Comprehensive Income Loss Before Tax Other comprehensive income (loss), related income tax Other Comprehensive Income Loss Tax Other comprehensive income (loss), after tax Other Comprehensive Income Loss Net Of Tax Comprehensive income (loss) Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest Less: Comprehensive income (loss) attributable to noncontrolling interests Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest Comprehensive income (loss) attributable to Targa Resources Corp. Comprehensive Income Net Of Tax The equity impact of the distribution equivalent rights during the period. Exercise and settlement of warrants shares. Adjustments to additional paid in capital preferred stock dividends in excess of retained earnings. Deemed preferred stock dividend accretion of beneficial conversion feature. Contributions from non controlling interest received during the period. Statement Of Stockholders Equity [Abstract] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock [Member] Common Stock [Member] Additional Paid-in Capital [Member] Additional Paid In Capital [Member] Retained Earnings (Accumulated Deficit) [Member] Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Other Comprehensive Income [Member] Treasury Shares [Member] Treasury Stock [Member] Noncontrolling Interests [Member] Noncontrolling Interest [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase Decrease In Stockholders Equity Roll Forward Balance Balance (in shares) Shares Outstanding Series A Preferred Stock Impact of accounting standard adoption (see Note 3) New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Quantification Compensation on equity grants Stock Granted During Period Value Sharebased Compensation Gross Distribution equivalent rights Distribution Equivalent Rights Shares issued under compensation program (in shares) Stock Issued During Period Shares Share Based Compensation Gross Shares and units tendered for tax withholding obligations Adjustments Related To Tax Withholding For Share Based Compensation Shares and units tendered for tax withholding obligations (in shares) Shares Paid For Tax Withholding For Share Based Compensation Issuance of common stock Stock Issued During Period Value New Issues Issuance of common stock (in shares) Stock Issued During Period Shares New Issues Exercise of warrants - share settled Exercise And Settlement Of Warrants Shares Series A Preferred Stock dividends Dividends Preferred Stock [Abstract] Dividends Dividends in excess of retained earnings Adjustments To Additional Paid In Capital Preferred Stock Dividends In Excess Of Retained Earnings Deemed dividends - accretion of beneficial conversion feature Deemed Preferred Stock Dividend Accretion Of Beneficial Conversion Feature Common stock dividends Dividends Common Stock [Abstract] Dividends Dividends Common Stock Dividends in excess of retained earnings Adjustments To Additional Paid In Capital Dividends In Excess Of Retained Earnings Distributions to noncontrolling interests Minority Interest Decrease From Distributions To Noncontrolling Interest Holders Contributions from noncontrolling interests Contributions From Non Controlling Interest Acquisition of related party (see Note 17) Noncontrolling Interest Increase From Business Combination Purchase of noncontrolling interests in subsidiary, net of tax impact Minority Interest Decrease From Redemptions Other comprehensive income (loss) Balance Balance (in shares) Series A Preferred Stock Debt obligations abstract Statement Of Cash Flows [Abstract] Cash flows from operating activities Net Cash Provided By Used In Operating Activities [Abstract] Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Amortization in interest expense Amortization Of Financing Costs And Discounts Compensation on equity grants Share Based Compensation Depreciation and amortization expense Accretion of asset retirement obligations Asset Retirement Obligation Accretion Expense Increase (decrease) in redemption value of mandatorily redeemable preferred interests Minority Interest Change In Redemption Value Deferred income tax expense (benefit) Deferred Income Tax Expense Benefit Equity (earnings) loss of unconsolidated affiliates Distributions of earnings received from unconsolidated affiliates Equity Method Investment Dividends Or Distributions Risk management activities Unrealized Gain Loss On Derivatives (Gain) loss on sale or disposition of assets Gain Loss On Sale Of Property (Gain) loss from financing activities Change in contingent considerations included in Other expense (income) Changes in operating assets and liabilities, net of business acquisitions: Increase Decrease In Operating Capital [Abstract] Receivables and other assets Increase Decrease In Accounts Receivable And Other Operating Assets Inventories Increase Decrease In Inventories Accounts payable and other liabilities Increase Decrease In Accounts Payable And Accrued Liabilities Net cash provided by operating activities Net Cash Provided By Used In Operating Activities Cash flows from investing activities Net Cash Provided By Used In Investing Activities [Abstract] Outlays for property, plant and equipment Payments To Acquire Property Plant And Equipment Outlays for business acquisition, net of cash acquired Payments To Acquire Businesses Net Of Cash Acquired Proceeds from sale of assets Proceeds From Sale Of Productive Assets Investments in unconsolidated affiliates Payments For Advance To Affiliate Return of capital from unconsolidated affiliates Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital Other, net Payments For Proceeds From Other Investing Activities Net cash used in investing activities Net Cash Provided By Used In Investing Activities Cash flows from financing activities Net Cash Provided By Used In Financing Activities [Abstract] Debt obligations: Debt Obligations [Abstract] Proceeds from borrowings under credit facilities Proceeds From Lines Of Credit Repayments of credit facilities Repayments Of Lines Of Credit Proceeds from borrowings under accounts receivable securitization facility Proceeds From Accounts Receivable Securitization Repayments of accounts receivable securitization facility Repayments Of Accounts Receivable Securitization Proceeds from issuance of senior notes and term loan Proceeds From Issuance Of Senior Long Term Debt Redemption of senior notes and term loan Repayments Of Senior Debt Proceeds from issuance of common stock Proceeds From Issuance Of Common Stock Costs incurred in connection with financing arrangements Payment Of Financing And Stock Issuance Costs Repurchase of shares and units under compensation plans Payments Related To Tax Withholding For Share Based Compensation Purchase of noncontrolling interests in subsidiary Payments To Minority Shareholders Contributions from noncontrolling interests Proceeds From Minority Shareholders Distributions to noncontrolling interests Payments Of Dividends Minority Interest Distributions to Partnership unitholders Distribution Made To Limited Partner Cash Distributions Paid Dividends paid to common and Series A preferred shareholders Payments Of Ordinary Dividends Net cash provided by (used in) financing activities Net Cash Provided By Used In Financing Activities Net change in cash and cash equivalents Cash And Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect