Related Party Transactions [Abstract] Related Party Transactions Disclosure Related Party Transactions Disclosure [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Nature of Business [Table] Nature of Business [Table] Nature of Business [Table] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Buckthorn Solar Drop Down Asset [Member] Buckthorn Solar Drop Down Asset [Member] Buckthorn Solar Drop Down Asset [Member] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] Unconsolidated Solar Partnerships [Member] Unconsolidated Solar Partnerships [Member] Unconsolidated Solar Partnerships [Member] August 2017 Drop Down Assets [Member] August 2017 Drop Down Assets [Member] August 2017 Drop Down Assets [Member] Agua Caliente [Member] Agua Caliente [Member] Agua Caliente [Member] March 2017 Drop Down Assets [Member] March 2017 Drop Down Assets [Member] March 2017 Drop Down Assets [Member] Agua Caliente Borrower 2 [Member] Agua Caliente Borrower 2 [Member] Agua Caliente Borrower 2 [Member] Other Ownership Interests Name [Axis] Other Ownership Interests Name [Axis] Other Ownership Interests, Name [Domain] Other Ownership Interests, Name [Domain] Financial Institutions [Member] Financial Institutions [Member] Represents the information pertaining to the financial institutions. Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Class D [Member] Common Class D [Member] Common Class D [Member] Long-term Contract for Purchase of Electric Power [Axis] Long-term Contract for Purchase of Electric Power [Axis] Long-term Contract for Purchase of Electric Power [Domain] Long-term Contract for Purchase of Electric Power [Domain] Southern California Edison [Member] Southern California Edison [Member] Southern California Edison [Member] Pacific Gas and Electric [Member] Pacific Gas and Electric [Member] Pacific Gas and Electric [Member] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] November 2015 Drop Down Assets [Member] November 2015 Drop Down Assets [Member] November 2015 Drop Down Assets [Member] CVSR [Member] CVSR [Member] CVSR [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Clearway Energy LLC [Member] Clearway Energy LLC [Member] Clearway Energy LLC [Member] NRG Yield [Member] NRG Yield [Member] NRG Yield [Member] GenConn Middletown GenConn Middletown [Member] GenConn Middletown [Member] GenConn Devon [Member] GenConn Devon [Member] GenConn Devon [Member] Marsh Landing Marsh Landing [Member] Marsh Landing [Member] El Segundo [Member] El Segundo [Member] El Segundo [Member] Walnut Creek [Member] Walnut Creek [Member] Walnut Creek [Member] Alpine [Member] Alpine [Member] Alpine [Member] Avenal [Member] Avenal [Member] Avenal [Member] Avra Valley Avra Valley [Member] Avra Valley [Member] NRG Solar Blythe LLC [Member] Blythe [Member] Blythe [Member] Borrego [Member] Borrego [Member] Borrego [Member] Desert Sunlight [Member] Desert Sunlight [Member] Desert Sunlight [Member] Kansas South [Member] Kansas South [Member] Kansas South [Member] Roadrunner Solar Roadrunner LLC [Member] Solar Roadrunner LLC [Member] TA - High Desert LLC [Member] TA - High Desert LLC [Member] TA - High Desert LLC [Member] Utah Portfolio [Member] Utah Portfolio [Member] Utah Portfolio [Member] AZ DG Solar Projects [Member] AZ DG Solar Projects [Member] AZ DG Solar Projects [Member] PFMG DG Solar Projects [Member] PFMG DG Solar Projects [Member] PFMG DG Solar Projects [Member] Alta I [Member] Alta I [Member] Alta I [Member] Alta II [Member] Alta II [Member] alta II [Member] Alta III [Member] Alta III [Member] Alta III Alta IV [Member] Alta IV [Member] Alta IV [Member] Alta V [Member] Alta V [Member] Alta V [Member] Alta X [Member] Alta X [Member] Alta X [Member] Alta XI [Member] Alta XI [Member] Alta XI [Member] South Trent South Trent Holding LLC [Member] South Trent Holding LLC [Member] Spanish Fork [Member] Spanish Fork [Member] Spanish Fork [Member] Spring Canyon II [Member] Spring Canyon II [Member] Spring Canyon II [Member] Laredo Ridge [Member] Laredo Ridge [Member] Laredo Ridge [Member] Lookout [Member] Lookout [Member] Lookout [Member] Odin Wind Farm [Member] Odin Wind Farm [Member] Odin Wind Farm [Member] Taloga [Member] Taloga [Member] Taloga [Member] Wildorado [Member] Wildorado [Member] Wildorado [Member] Pinnacle [Member] Pinnacle [Member] Pinnacle [Member] San Juan Mesa Wind Project, LLC [Member] San Juan Mesa Wind Project, LLC [Member] San Juan Mesa Wind Project, LLC [Member] Sleeping Bear [Member] Sleeping Bear [Member] Sleeping Bear [Member] Buffalo Bear [Member] Buffalo Bear [Member] Buffalo Bear [Member] Crosswinds [Member] Crosswinds [Member] Crosswinds [Member] Elbow Creek [Member] Elbow Creek [Member] Elbow Creek [Member] Elkhorn Ridge Wind, LLC [Member] Elkhorn Ridge Wind, LLC [Member] Elkhorn Ridge Wind, LLC [Member] Forward [Member] Forward [Member] Forward [Member] Goat Wind [Member] Goat Wind [Member] Goat Wind [Member] Hardin [Member] Hardin [Member] Hardin [Member] Spring Canyon [Member] Spring Canyon [Member] Spring Canyon [Member] Spring Canyon III [Member] Spring Canyon III [Member] Spring Canyon III [Member] Thermal [Member] Thermal [Member] Represents Thermal segment of the entity. SPP Projects [Member] SPP Projects [Member] SPP Projects [Member] Other DG Assets [Member] Other DG Assets [Member] Other DG Assets [Member] Buckthorn Solar [Member] Buckthorn Solar [Member] Buckthorn Solar [Member] Energy Center Dover [Member] Energy Center Dover [Member] Energy Center Dover [Member] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] Clearway Energy, Inc. [Member] Clearway Energy, Inc. [Member] Clearway Energy, Inc. [Member] CEG [Member] CEG [Member] CEG [Member] Power Generation Facilities by Type [Axis] Power Generation Facilities by Type [Axis] The types of power generation facilities included in the entity's total global generation portfolio. Power Generation Facilities, Type [Domain] Power Generation Facilities, Type [Domain] Listing of power generation facilities included in the entity's total global generation portfolio. Conventional Generation, Utility-Scale Solar, Distributed Solar, and Wind [Member] Conventional Generation, Utility-Scale Solar, Distributed Solar, and Wind [Member] Conventional Generation, Utility-Scale Solar, Distributed Solar, and Wind [Member] Conventional Generation [Member] Conventional Generation [Member] Conventional Generation [Member] Utility-Scale Solar Utility-Scale Solar [Member] Utility-Scale Solar [Member] Distributed Solar [Member] Distributed Solar [Member] Distributed solar generation capacity. Wind Farms [Member] Wind Farms [Member] Wind farm generation capacity. Nature of Business Basis of Presentation [Line Items] Basis of Presentation [Line Items] Weighted Average Remaining PPA Term Weighted Average Remaining PPA Term Weighted Average Remaining PPA Term Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Voting Interest Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Voting Interest Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Voting Interest Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest Percentage of Ownership Percentage of Ownership Percentage of Ownership Equity Method Investment, Ownership Percentage Equity Method Investment, Ownership Percentage Power Generation Capacity, Megawatts Power Generation Capacity, Megawatts The generation capacity of the entity's power generation facilities as of the balance sheet date, expressed in megawatts. Sale of Stock, Number of Shares Issued in Transaction Sale of Stock, Number of Shares Issued in Transaction Proceeds from Issuance or Sale of Equity Proceeds from Issuance or Sale of Equity Steam and Chilled Water Capacity, Megawatts Thermal Equivalent Steam and Chilled Water Capacity, Megawatts Thermal Equivalent The generation capacity of the entity's thermal power generation facilities as of the balance sheet date, expressed in megawatts thermal equivalent. Power Generation Capacity, Megawatts attributed to noncontrolling interest Power Generation Capacity, Megawatts attributed to noncontrolling interest Power Generation Capacity, Megawatts attributed to noncontrolling interest Power Generation Capacity, Megawatts, including portion attributable to noncontrolling interest Power Generation Capacity, Megawatts, including portion attributable to noncontrolling interest Power Generation Capacity, Megawatts, including portion attributable to noncontrolling interest Megawatts Thermal Equivalent, Available Under right-to-use Provisions Megawatts Thermal Equivalent, Available Under right-to-use Provisions Megawatts Thermal Equivalent, Available Under right-to-use Provisions Business Acquisitions, Purchase Price Business Combination, Consideration Transferred Long-term Debt Long-term Debt Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Earnings Per Share [Abstract] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] 3.5% Convertible Notes due 2019 [Member] 3.5% Convertible Notes due 2019 [Member] 3.5% Convertible Notes due 2019 [Member] 3.25% Convertible Notes due 2020 [Member] 3.25% Convertible Notes due 2020 [Member] 3.25% Convertible Notes due 2020 [Member] Common Class A [Member] Common Class A [Member] Common Class C [Member] Common Class C [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Net Income (Loss) Available to Common Stockholders, Basic Net Income (Loss) Available to Common Stockholders, Basic Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Basic Earnings Per Share, Basic Earnings Per Share, Basic Net Income (Loss) Available to Common Stockholders, Diluted Net Income (Loss) Available to Common Stockholders, Diluted Weighted Average Number of Shares Outstanding, Diluted Weighted Average Number of Shares Outstanding, Diluted Earnings Per Share, Diluted Earnings Per Share, Diluted Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Nature of Business Business Description and Basis of Presentation [Text Block] Business Combinations [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Ownership [Axis] Ownership [Axis] Ownership [Domain] Ownership [Domain] Business Acquisition [Line Items] Business Acquisition [Line Items] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Business Combination, Consideration Transferred Proceeds from Noncontrolling Interests Proceeds from Noncontrolling Interests Fair Value Disclosures [Abstract] Estimated carrying values and fair values Fair Value, by Balance Sheet Grouping [Table Text Block] Fair Value Option, Disclosures [Table Text Block] Fair Value Option, Disclosures [Table Text Block] Schedule of Fair Value, Assets and Liabilities [Table Text Block] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Segment Reporting [Abstract] Segment Reporting, Policy [Policy Text Block] Segment Reporting, Policy [Policy Text Block] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] UPMC Thermal [Member] UPMC Thermal [Member] UPMC Thermal [Member] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Management Service, Base [Member] Management Service, Base [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Related Party Transaction [Axis] Related Party Transaction [Axis] Related Party Transaction [Domain] Related Party Transaction [Domain] Operations and Maintenance services [Member] Operations and Maintenance services [Member] Operations and Maintenance services [Member] NRG [Member] NRG [Member] NRG [Member] Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Thermal [Member] GCE Holding LLC [Member] GCE Holding LLC [Member] Represents the GCE Holding LLC GCE Holding LLC which wholly-owns GenConn Energy LLC. Marsh Landing [Member] RENOM [Member] RENOM [Member] RENOM [Member] Related Party Transaction Related Party Transaction [Line Items] Revenue from Related Parties Revenue from Related Parties Related Party Transaction, Expenses from Transactions with Related Party Related Party Transaction, Expenses from Transactions with Related Party Due to Affiliate Due to Affiliate General and administrative General and Administrative Expense Accounts Payable, Related Parties Accounts Payable, Related Parties Statement of Financial Position [Abstract] ASSETS Assets [Abstract] Current Assets Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Restricted cash Restricted Cash and Cash Equivalents, Current Accounts receivable — trade Accounts Receivable, Net, Current Inventory Inventory, Net Notes receivable Notes, Loans and Financing Receivable, Net, Current Prepayments and other current assets Prepaid Expense and Other Assets, Current Total current assets Assets, Current Property, plant and equipment, net Property, Plant and Equipment, Net Other Assets Assets, Noncurrent [Abstract] Equity investments in affiliates Equity Method Investments Intangible assets, net Finite-Lived Intangible Assets, Net Derivative instruments Derivative Asset, Noncurrent Deferred income taxes Deferred Tax Assets, Net, Noncurrent Other non-current assets Other Assets, Noncurrent Total other assets Other Assets Total Assets Assets LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] Current Liabilities Liabilities, Current [Abstract] Current portion of long-term debt Long-term Debt and Capital Lease Obligations, Current Accounts payable — trade Accounts Payable, Current Accounts payable — affiliate Due to Affiliate, Current Derivative instruments Derivative Liability, Current Accrued expenses and other current liabilities Other Accrued Liabilities, Current Total current liabilities Liabilities, Current Other Liabilities Liabilities, Noncurrent [Abstract] Long-term debt Long-term Debt and Capital Lease Obligations Derivative instruments Derivative Liability, Noncurrent Other non-current liabilities Other Liabilities, Noncurrent Total non-current liabilities Liabilities, Noncurrent Total Liabilities Liabilities Commitments and Contingencies Commitments and Contingencies Stockholders' Equity Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.01 par value; 10,000,000 shares authorized; none issued Preferred Stock, Value, Issued Class A, Class B, Class C and Class D common stock, $0.01 par value; 3,000,000,000 shares authorized (Class A 500,000,000, Class B 500,000,000, Class C 1,000,000,000, Class D 1,000,000,000); 193,137,143 shares issued and outstanding (Class A 34,586,250, Class B 42,738,750, Class C 73,073,393, Class D 42,738,750) at September 30, 2018 and 184,780,837 shares issued and outstanding (Class A 34,586,250, Class B 42,738,750, Class C 64,717,087, Class D 42,738,750) at December 31, 2017 Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Retained earnings (accumulated deficit) Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Noncontrolling interest Stockholders' Equity Attributable to Noncontrolling Interest Total Stockholders' Equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total Liabilities and Stockholders' Equity Liabilities and Equity Equity [Abstract] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Class of Stock [Line Items] Class of Stock [Line Items] Common Stock, Par or Stated Value Per Share Common Stock, Par or Stated Value Per Share ATM Program, Maximum Dollar Value of Shares to Be Issued ATM Program, Maximum Dollar Value of Shares to Be Issued ATM Program, Maximum Dollar Value of Shares to Be Issued Proceeds from Issuance of Common Stock, Before Commission Fees Proceeds from Issuance of Common Stock, Before Commission Fees Proceeds from Issuance of Common Stock, Before Commission Fees Commission Fees Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions ATM program, dollar value of shares remaining ATM program, dollar value of shares remaining ATM program, dollar value of shares remaining Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative [Table] Derivative [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Noncontrolling Interest [Member] Noncontrolling Interest [Member] Derivative [Line Items] Derivative [Line Items] Accumulated Other Comprehensive Loss, Net of Tax Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax Accumulated Other Comprehensive Loss, Cumulative Change in Loss from Cash Flow Hedges, Tax Amount AOCI Including Portion Attributable to Noncontrolling Interest, Tax Reclassified from accumulated OCL to income due to realization of previously deferred amounts Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Mark-to-market of cash flow hedge accounting contracts Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax Losses expected to be realized from OCL during the next 12 months, net of income tax benefit of $1 Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months Losses expected to be realized from OCL during the next 12 months, Tax Amount Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months, Tax The estimated tax impact of existing gains or losses on cash flow hedges, at the reporting date, which are expected to be reclassified to earnings within the next 12 months. Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net Changes in Capital Structure [Abstract] Changes in Capital Structure [Abstract] Partners' Capital Notes Disclosure [Text Block] Partners' Capital Notes Disclosure [Text Block] Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Interest Expense [Member] Interest Expense [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Commodity Contract [Member] Commodity Contract [Member] Interest Rate Contract [Member] Interest Rate Contract [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Derivative Asset, Fair Value, Gross Asset Derivative Asset, Fair Value, Gross Asset Derivative Liability, Fair Value, Gross Liability Derivative Liability, Fair Value, Gross Liability Derivative Assets (Liabilities), at Fair Value, Net Derivative Assets (Liabilities), at Fair Value, Net Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Letter of Credit [Member] Letter of Credit [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] 5.375% Senior Notes due in 2024 [Member] 5.375% Senior Notes due in 2024 [Member] 5.375% Senior Notes due in 2024 [Member] 5.00% Senior Notes due in 2026 [Member] 5.00% Senior Notes due in 2026 [Member] 5.00% Senior Notes due in 2026 [Member] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Alpine Financing Agreement, due 2022 [Member] Alpine Financing Agreement, due 2022 [Member] Alpine Financing Agreement, due 2022 [Member] Alta Wind I-V, lease financing arrangement, due 2034 and 2035 [Member] Alta Wind I-V, lease financing arrangement, due 2034 and 2035 [Member] Alta Wind I-V, lease financing arrangement, due 2034 and 2035 [Member] Buckthorn Solar, due 2025 [Member] Buckthorn Solar, due 2025 [Member] Buckthorn Solar, due 2025 [Member] CVSR, due 2037 CVSR Financing Agreement [Member] CVSR Financing Agreement [Member] CVSR Holdco due 2037 [Member] CVSR Holdco due 2037 [Member] CVSR Holdco due 2037 [Member] El Segundo Energy Center, due 2023 El Segundo Energy Center, due 2023 [Member] El Segundo Energy Center, due 2023 [Member] West Holdings Credit Agreement due 2023 Tranche B [Member] El Segundo Energy Center, due 2023 Tranche B [Member] El Segundo Energy Center, due 2023 Tranche B [Member] West Holdings Credit Agreement due 2023 Tranche A [Member] El Segundo Energy Center, due 2023 Tranche A [Member] El Segundo Energy Center, due 2023 Tranche A [Member] Energy Center Minneapolis Series C Notes, due 2025 Energy Center Minneapolis Series C Notes [Member] Energy Center Minneapolis Series C Notes [Member] Energy Center Minneapolis Series D Notes, due 2031 Energy Center Minneapolis Series D Notes [Member] Energy Center Minneapolis Series D Notes [Member] Energy Center Minneapolis Series E, F, G, H Notes [Member] Energy Center Minneapolis Series E, F, G, H Notes [Member] Energy Center Minneapolis Series E, F, G, H Notes [Member] Laredo Ridge Wind, LLC, due in 2026 [Member] Laredo Ridge Wind, LLC, due in 2026 [Member] Laredo Ridge Wind, LLC, due in 2026 [Member] Marsh Landing Term Loan Facility [Member] Marsh Landing Term Loan Facility [Member] Marsh Landing Term Loan Facility [Member] Tapestry Wind LLC due in 2021 [Member] Tapestry Wind LLC due in 2021 [Member] Tapestry Wind LLC due in 2021 [Member] Utah Solar Portfolio, due 2022 [Member] Utah Solar Portfolio, due 2022 [Member] Utah Solar Portfolio, due 2022 [Member] Viento Funding II, Inc., due in 2023 [Member] Viento Funding II, Inc., due in 2023 [Member] Viento Funding II, Inc., due in 2023 [Member] Walnut Creek Energy, LLC, due in 2023 [Member] Walnut Creek Energy, LLC, due in 2023 [Member] Walnut Creek Energy, LLC, due in 2023 [Member] Other Debt [Member] Other Debt [Member] Represents other debt instruments not separately accounted disclosed. Project [Domain] Project [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Senior Notes Senior Notes Current portion of long-term debt Debt Issuance Costs, Net Debt Issuance Costs, Net Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Letters of Credit Outstanding, Amount Letters of Credit Outstanding, Amount Long-term Debt, Excluding Current Maturities Long-term Debt, Excluding Current Maturities Debt Instrument, Description of Variable Rate Basis Debt Instrument, Description of Variable Rate Basis Debt Instrument, Basis Spread on Variable Rate Debt Instrument, Basis Spread on Variable Rate Debt Instrument, Unamortized Discount Debt Instrument, Unamortized Discount Dividends Per Common Share, Cash Paid Common Stock, Dividends, Per Share, Cash Paid Dividends Payable, Date Declared Dividends Payable, Date Declared Common Stock, Dividends, Per Share, Declared Common Stock, Dividends, Per Share, Declared Dividends Payable, Date to be Paid Dividends Payable, Date to be Paid Dividends Payable, Date of Record Dividends Payable, Date of Record Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized Preferred Stock, Par or Stated Value Per Share Preferred Stock, Par or Stated Value Per Share Equity Method Investments and Joint Ventures [Abstract] Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] DGPV Holdco 2 [Member] NRG DGPV Holdco 2 [Member] NRG DGPV Holdco 2 [Member] Four Brothers Solar [Member] Four Brothers Solar [Member] Four Brothers Solar [Member] Granite Mountain Holdings [Member] Granite Mountain Holdings [Member] Granite Mountain Holdings [Member] Iron Springs Holdings [Member] Iron Springs Holdings [Member] Iron Springs Holdings [Member] Gen Conn Energy LLC [Member] Gen Conn Energy LLC [Member] Represents the information pertaining to GenConn Energy LLC. DGPV Holdco 1 [Member] DGPV Holdco 1 [Member] DGPV Holdco 1 [Member] RPV Holdco [Member] RPV Holdco [Member] RPV Holdco [Member] DGPV Holdco 3 [Member] DGPV Holdco 3 [Member] DGPV Holdco 3 [Member] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Payments to Acquire Interest in Subsidiaries and Affiliates Payments to Acquire Interest in Subsidiaries and Affiliates Remaining Lease Term Remaining Lease Term Remaining Lease Term Dividends Declared [Table Text Block] Dividends Declared [Table Text Block] Fair Value, Concentration of Risk [Table] Fair Value, Concentration of Risk [Table] Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Domain] Other Comprehensive Income Location [Domain] Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] Fair Value Assets, Valuation Techniques, Impact of Credit Reserve to Fair Value Fair Value Assets, Measured on Recurring Basis, Valuation Techniques, Impact of Credit Reserve to Fair Value This element represents the increase (decrease) to fair value from applying a credit reserve to reflect credit risk on the valuation techniques used to measure fair value of Level 2 and 3 derivative contracts which is calculated based on credit default swaps. Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure Estimated Counterparty Credit Risk Exposure to Certain Counterparties, Period Estimated Counterparty Credit Risk Exposure to Certain Counterparties, Period Estimated Counterparty Credit Risk Exposure to Certain Counterparties, Period Repowering Partnership LLC [Member] Repowering Partnership LLC [Member] Repowering Partnership LLC [Member] Alta X and XI TE Holdco [Member] Alta X and XI TE Holdco [Member] Alta X and XI TE Holdco [Member] Other Assets Property, Plant and Equipment, Net Intangible Assets Intangible Assets, Net (Excluding Goodwill) Total Assets Liabilities Noncontrolling Interest in Variable Interest Entity Noncontrolling Interest in Variable Interest Entity Net Assets Net Assets Less: Income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Payments for Deposits Payments for Deposits Accounts Payable Accounts Payable Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Accounting Policies [Abstract] Revenue Recognition, Policy [Policy Text Block] Revenue Recognition, Policy [Policy Text Block] Income Tax, Policy [Policy Text Block] Income Tax, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Noncontrolling Interest Disclosure [Text Block] Noncontrolling Interest Disclosure [Text Block] Distributions [Policy Text Block] Distributions [Policy Text Block] Distributions [Policy Text Block] Recent Accounting Developments New Accounting Pronouncements, Policy [Policy Text Block] Business Acquisitions [Abstract] Business Acquisitions [Abstract] Mergers, Acquisitions and Dispositions Disclosures [Text Block] Mergers, Acquisitions and Dispositions Disclosures [Text Block] Schedule of Accumulated Depreciation and Amortization [Table Text Block] Schedule of Accumulated Depreciation and Amortization [Table Text Block] Schedule of Accumulated Depreciation and Amortization [Table Text Block] Schedule of Change in Noncontrolling Interest [Table Text Block] Schedule of Change in Noncontrolling Interest [Table Text Block] Schedule of Change in Noncontrolling Interest [Table Text Block] Distributions Made to Limited Liability Company (LLC) Member, by Distribution [Table Text Block] Distributions Made to Limited Liability Company (LLC) Member, by Distribution [Table Text Block] Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table Text Block] Contract with Customer, Asset and Liability [Table Text Block] Contract with Customer, Asset and Liability [Table Text Block] Document And Entity Information [Abstract] -- None. No documentation exists for this element. -- Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Current Fiscal Year End Date Current Fiscal Year End Date Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Common Class B [Member] Common Class B [Member] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Income Statement [Abstract] Statement [Table] Statement [Table] Statement Statement [Line Items] Operating Revenues Revenues [Abstract] Total operating revenues Revenues Operating Costs and Expenses Operating Costs and Expenses [Abstract] Cost of operations Cost of Revenue Depreciation and amortization Depreciation, Depletion and Amortization Impairment losses Asset Impairment Charges Acquisition-related transaction and integration costs Business Combination, Acquisition Related Costs Development costs Costs Incurred, Development Costs Total operating costs and expenses Costs and Expenses Operating Income Operating Income (Loss) Other Income (Expense) Costs and Expenses [Abstract] Equity in earnings of unconsolidated affiliates Income (Loss) from Equity Method Investments Other income, net Other Nonoperating Income (Expense) Loss on debt extinguishment Gain (Loss) on Extinguishment of Debt Interest expense Interest Expense Total other expense, net Nonoperating Income (Expense) Income Before Income Taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Net Income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Less: Pre-acquisition net (loss) income of Drop Down Assets Less: Pre-acquisition net income of Acquired ROFO assets Less: Pre-acquisition net income of Acquired ROFO assets Net Income Excluding Pre-acquisition Net Income of Drop Down Assets Net Income excluding pre-acquisition net income of Acquired ROFO assets Net Income excluding pre-acquisition net income of Acquired ROFO assets Net Income Attributable to Clearway Energy, Inc. Earnings Per Share Attributable to Clearway Energy, Inc. Class A and Class C Common Stockholders Net notional volume buy/(sell) of NRG Yield's open derivative transactions broken out by commodity Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Fair value within the derivative instrument valuation on the balance sheets Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block] Offsetting of derivatives by counterparty master agreement level and collateral received or paid Offsetting Liabilities [Table Text Block] Effects of NRG Yield's accumulated OCI balance attributable to interest rate swaps designated as cash flow hedge derivatives, net of tax Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Commitments and Contingencies Disclosure [Abstract] Contingencies Disclosure [Text Block] Contingencies Disclosure [Text Block] Statement of Comprehensive Income [Abstract] Unrealized gain/loss on derivatives, income tax expense /(benefit) Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Net income Other Comprehensive Gain, net of tax Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Unrealized gain on derivatives, net of income tax expense of $1, $0, $4 and $0 Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Other comprehensive gain Other Comprehensive Income (Loss), Net of Tax Comprehensive Income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Less: Comprehensive income attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive Income Attributable to Clearway Energy, Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Nature of Business Disclosure [Abstract] -- None. No documentation exists for this element. -- Clearway Energy Org Structure Clearway Energy Organizational Structure [Table Text Block] Clearway Energy Org Structure [Table Text Block] Schedule of Ownership Schedule of Ownership Percentage, Net Capacity, Offtake Counterparty and Year of Offtake Expiration by Operating Asset [Table Text Block] Schedule of Ownership Percentage, Net Capacity, Offtake Counterparty and Year of Offtake Expiration by Operating Asset [Table Text Block] Investments Accounted for by the Equity Method and Variable Interest Entities Equity Method Investments and Joint Ventures Disclosure [Text Block] Subsequent Event [Member] Subsequent Event [Member] Bridge Loan [Member] Bridge Loan [Member] 5.75% Senior Notes due 2025 [Member] 5.75% Senior Notes due 2025 [Member] 5.75% Senior Notes due 2025 [Member] Intercompany Credit Agreement due 2019 [Member] Intercompany Credit Agreement due 2019 [Member] Intercompany Credit Agreement due 2019 [Member] NRG Energy Center Minneapolis Series E Notes [Member] Energy Center Minneapolis Series E Notes [Member] Energy Center Minneapolis Series E Notes [Member] NRG Energy Center Minneapolis Series F Notes [Member] Energy Center Minneapolis Series F Notes [Member] Energy Center Minneapolis Series F Notes [Member] NRG Energy Center Minneapolis Series G Notes [Member] Energy Center Minneapolis Series G Notes [Member] Energy Center Minneapolis Series G Notes [Member] NRG Energy Center Minneapolis Series H Notes [Member] Energy Center Minneapolis Series H Notes [Member] Energy Center Minneapolis Series H Notes [Member] Line of Credit Facility, Fair Value of Amount Outstanding Line of Credit Facility, Fair Value of Amount Outstanding Proceeds from Issuance of Debt Proceeds from Issuance of Debt Repayments of Debt Repayments of Debt Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Debt Instrument, Basis Spread on Libor Rate Debt Instrument, Basis Spread on Libor Rate Debt Instrument, Basis Spread on Libor Rate Derivative, Nonmonetary Notional Amount, Percent of Required Need, Coverage Derivative, Nonmonetary Notional Amount, Percent of Required Need, Coverage Proceeds from (Repayments of) Debt Proceeds from (Repayments of) Debt Restatement [Axis] Restatement [Axis] Restatement [Domain] Restatement [Domain] Previously Reported [Member] Previously Reported [Member] November 2017 Drop Down Assets [Member] November 2017 Drop Down Assets [Member] November 2017 Drop Down Assets [Member] Operating Income (Loss) Net Income (Loss) Central CA Fuel Cell 1 [Member] Central CA Fuel Cell 1 [Member] Central CA Fuel Cell 1 [Member] Power Purchase Agreement Period Power Purchase Agreement Period Represents the period of power purchase agreement Accounting for Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] Business Acquisition, Percentage of Voting Interests Acquired Business Acquisition, Percentage of Voting Interests Acquired Business Combination, Contingent Consideration, Liability Business Combination, Contingent Consideration, Liability Percentage of NRG's Ownership Percentage of NRG's Ownership Percentage of NRG's Ownership Remaining Power Purchase Agreement term Remaining Power Purchase Agreement term Remaining Power Purchase Agreement term Percentage of Cash Available for Distributions Percentage of Cash Available for Distributions Percentage of Cash Available for Distributions Business Acquisition, Consideration Transferred, Working Capital Business Acquisition, Consideration Transferred, Working Capital Business Acquisition, Consideration Transferred, Working Capital Non-Recourse Debt Non-Recourse Debt Business Combination, Separately Recognized Transactions, Net Gains and Losses Business Combination, Separately Recognized Transactions, Net Gains and Losses Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Equity Interest Type [Axis] Equity Interest Type [Axis] Equity Interest Issued or Issuable, Type [Domain] Equity Interest Issued or Issuable, Type [Domain] Capital Unit, Class A [Member] Capital Unit, Class A [Member] Capital Unit, Class B [Member] Capital Unit, Class B [Member] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Taxable Income Allocation, Pre-Flip Taxable Income Allocation, Pre-Flip Taxable Income Allocation, Pre-Flip Taxable Income Allocation, Post-Flip Taxable Income Allocation, Post-Flip Taxable Income Allocation, Post-Flip Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Statement of Cash Flows [Abstract] Cash Flows from Operating Activities Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Equity in earnings of unconsolidated affiliates Distributions from unconsolidated affiliates Proceeds from Equity Method Investment, Distribution Depreciation and amortization Depreciation, Amortization and Accretion, Net Amortization of financing costs and debt discounts Amortization of Debt Issuance Costs and Discounts Amortization of intangibles and out-of-market contracts Amortization of Intangibles and Out of Market Contracts The aggregate (income) expense recorded in earnings to allocate the cost of out-of-market contracts and intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash (income) expense, this element is added back to net income when calculating cash provided by (used in) operations using the indirect method. Adjustment for debt extinguishment Changes in deferred income taxes Increase (Decrease) in Income Taxes Derivative interest income Increase (Decrease) in Derivative Assets and Liabilities (Gain) loss on disposal of asset components Gain (Loss) on Disposition of Property Plant Equipment Changes in prepaid and accrued liabilities for tolling agreements Changes in Prepaid and Accrued Capacity Payments Changes in Prepaid and Accrued Capacity Payments Changes in other working capital Increase (Decrease) in Other Operating Assets and Liabilities, Net 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] Acquisition of businesses, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Payments for the Drop Down Assets Payment to Acquire Business under Common Control Payment to Acquire Business under Common Control Capital expenditures Payments to Acquire Property, Plant, and Equipment Cash receipts from notes receivable Increase (Decrease) in Notes Receivables Return of investment from unconsolidated affiliates Proceeds from Equity Method Investment, Distribution, Return of Capital Investments in unconsolidated affiliates Payments to Acquire Businesses and Interest in Affiliates Payments for (Proceeds from) Other Investing Activities 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] Net contributions from noncontrolling interests Proceeds from (Payments to) Noncontrolling Interests Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets Payments of Capital Distribution Net proceeds from the issuance of common stock Proceeds from Issuance of Common Stock Payments of dividends and distributions Payments of Dividends Payments of debt issuance costs Payments of Debt Issuance Costs Proceeds from the revolving credit facility Proceeds from Lines of Credit Repayments of Lines of Credit Repayments of Lines of Credit Proceeds from the issuance of long-term debt Proceeds from Issuance of Long-term Debt Payments for long-term debt Repayments of Long-term Debt Net Cash Used in Financing Activities Net Cash Provided by (Used in) Financing Activities Net Decrease in Cash, Cash Equivalents and Restricted Cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Cash, Cash Equivalents and Restricted Cash at Beginning of Period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, Cash Equivalents and Restricted Cash at End of Period Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Consolidated Entities [Member] Consolidated Entities [Member] Entities that are not consolidated [Member] Entities that are not consolidated [Member] Entities that are not consolidated [Member] Schedule of Variable Interest Entities [Table Text Block] Schedule of Variable Interest Entities [Table Text Block] Preferred Stock [Member] Preferred Stock [Member] Preferred Stock, Shares Issued Preferred Stock, Shares Issued Common Stock, Shares Authorized Common Stock, Shares Authorized Common Stock, Shares, Issued Common Stock, Shares, Issued Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Unrealized Gain (Loss) on Derivatives Unrealized Gain (Loss) on Derivatives Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Summary of Significant Accounting Policies [Table] Summary of Significant Accounting Policies [Table] Summary of Significant Accounting Policies [Table] Energy Revenue [Member] Energy Revenue [Member] Energy Revenue [Member] Capacity Revenue [Member] Capacity Revenue [Member] Capacity Revenue [Member] Segments [Axis] Segments [Axis] Segment [Domain] Segments [Domain] Renewables [Member] Renewables [Member] Renewables [Member] Receivable Type [Axis] Receivable Type [Axis] Receivable [Domain] Receivable [Domain] Customer Contracts [Member] Customer Contracts [Member] Lease Agreements [Member] Lease Agreements [Member] Summary of Significant Accounting Policies [Line Items] Summary of Significant Accounting Policies [Line Items] [Line Items] for Summary of Significant Accounting Policies [Table] Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Finite-Lived Intangible Assets, Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Stockholders' Equity Attributable to Noncontrolling Interest Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Capital contributions from tax equity investors, net of distributions (b) Dividends, Common Stock, Stock Dividends, Common Stock, Stock Payment for the Buckthorn Solar Drop Down Asset Payments to Acquire Businesses, Gross Payment of capital distributions and returns of capital, net of capital distributions, non-cash Payment of capital distributions and returns of capital, net of capital distributions, non-cash Payment of capital distributions and returns of capital, net of capital distributions, non-cash Pre-acquisition net income of the Buckthorn Solar Drop Down Asset Comprehensive income Distributions to NRG, net (c) Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Distribution Made to Limited Liability Company (LLC) Member, Distributions Paid, Per Unit Distribution Made to Limited Liability Company (LLC) Member, Distributions Paid, Per Unit Revenue from Contract with Customer, Excluding Assessed Tax Revenue from Contract with Customer, Excluding Assessed Tax Capitalized Contract Cost, Amortization Capitalized Contract Cost, Amortization Operating Leases, Income Statement, Contingent Revenue Operating Leases, Income Statement, Contingent Revenue Accounts Receivable, Net Accounts Receivable, Net Income Tax Contingency [Table] Income Tax Contingency [Table] Income Tax Disclosure Income Tax Contingency [Line Items] Income Tax Expense (Benefit), Continuing Operations [Abstract] Income Tax Expense (Benefit), Continuing Operations [Abstract] Income before income taxes Effective income tax rate Effective Income Tax Rate Reconciliation, Percent U.S. federal statutory rate (as a percent) Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Segment Reporting Segment Reporting Disclosure [Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Conventional Generation Corporate Corporate Segment [Member] Segment Reporting Segment Reporting Information [Line Items] Operating revenues Cost of operations Operating Expenses Equity in earnings of unconsolidated affiliates Other income, net Interest expense Income (loss) before income taxes Reconciliation of the U.S. federal statutory rate to the Company's effective rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] November 2017 Drop Down Assets and August 2017 Drop Down Assets [Member] November 2017 Drop Down Assets and August 2017 Drop Down Assets [Member] November 2017 Drop Down Assets and August 2017 Drop Down Assets [Member] Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Business Acquisition, Pro Forma Information [Table Text Block] Business Acquisition, Pro Forma Information [Table Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Underlying Asset Class [Axis] Underlying Asset Class [Axis] Underlying Asset Class [Domain] Underlying Asset Class [Domain] Interest [Member] Interest [Member] Details pertaining to interest rate swaps which are considered a derivative commodity. Natural Gas [Member] Natural Gas [Member] Interest Rate Contract Current [Member] Interest Rate Contract Current [Member] The current portion of a derivative instrument whose primary underlying risk is tied to the right to receive or pay a sum of money at a given interest rate. Interest Rate Contract Non Current [Member] Interest Rate Contract Non Current [Member] The noncurrent portion of a derivative instrument whose primary underlying risk is tied to the right to receive or pay a sum of money at a given interest rate. Commodity Contract Current [Member] Commodity Contract Current [Member] The current portion of a derivative instrument whose primary underlying risk is tied to commodity prices. Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Designated as Hedging Instrument [Member] Designated as Hedging Instrument [Member] Not Designated as Hedging Instrument [Member] Not Designated as Hedging Instrument [Member] Measurement Unit [Axis] Measurement Unit [Axis] Represents information pertaining to various measurement units. Measurement Unit [Domain] Measurement Unit [Domain] Represents various measurement units used by the entity. MMbtu [Member] MMbtu [Member] Represents unit of measurement that is used to measure quantity of natural gas. United States of America, Dollars United States of America, Dollars Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Derivative, Notional Amount Derivative, Notional Amount Derivative Asset, Fair Value, Gross Liability Derivative Asset, Fair Value, Gross Liability Derivative Liability, Fair Value, Gross Asset Derivative Liability, Fair Value, Gross Asset Derivative Asset Derivative Asset Derivative Liability Derivative Liability Fair Value of Gross Derivative Assets/(Liabilities), Net Fair Value of Gross Derivative Assets/(Liabilities), Net Fair value of gross derivative assets less fair value of gross derivative liabilities. Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset Derivative Asset, Fair Value, Amount Offset Against Collateral Net Of Derivative Liability, Fair Value, Amount Offset Against Collateral Derivative Asset, Fair Value, Amount Offset Against Collateral Net Of Derivative Liability, Fair Value, Amount Offset Against Collateral Derivative Asset, Fair Value, Amount Offset Against Collateral Net Of Derivative Liability, Fair Value, Amount Offset Against Collateral Derivative, Collateral, Right to Reclaim Cash Derivative, Collateral, Right to Reclaim Cash Derivative, Collateral, Obligation to Return Cash Derivative, Collateral, Obligation to Return Cash Earnings Per Share Earnings Per Share [Text Block] Long-term Debt Long-term Debt [Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Estimate of Fair Value Measurement [Member] Estimate of Fair Value Measurement [Member] Reported Value Measurement [Member] Reported Value Measurement [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Financing Receivable, Net Financing Receivable, Net Long-term Debt and Capital Lease Obligations, Including Current Maturities Long-term Debt and Capital Lease Obligations, Including Current Maturities Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Long-term Debt Instruments [Table Text Block] Schedule of long-term debt Schedule of Debt [Table Text Block]