Leases [Abstract] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Operating lease liabilities Operating Lease, Liability ROU Assets - operating leases Operating Lease, Right-of-Use Asset Weighted average discount rate (as a percentage) Operating Lease, Weighted Average Discount Rate, Percent Accounting Policies [Abstract] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] PG&E [Member] PG&E [Member] PG&E [Member] Receivable Type [Axis] Receivable Type [Axis] Receivable [Domain] Receivable [Domain] Customer Contracts [Member] Customer Contracts [Member] Lease Agreements [Member] Lease Agreements [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Accounts Receivable, Related Parties, Noncurrent Accounts Receivable, Related Parties, Noncurrent Total accounts receivable, net (a) Accounts Receivable, Net Condensed Consolidating Financial Information Disclosure [Abstract] -- None. No documentation exists for this element. -- Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] 5.375% Senior Notes due in 2024 [Member] 5.375% Senior Notes due in 2024 [Member] 5.375% Senior Notes due in 2024 [Member] 5.75% Senior Notes due 2025 [Member] 5.75% Senior Notes due 2025 [Member] 5.75% Senior Notes due 2025 [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] Debt Instrument [Line Items] Debt Instrument [Line Items] Senior Notes Senior Notes Business Combinations [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] NRG NRG [Member] NRG [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [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. Thermal [Member] Thermal [Member] Represents Thermal segment of the entity. UPMC Thermal [Member] UPMC Thermal [Member] UPMC Thermal [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Central CA Fuel Cell 1 [Member] Central CA Fuel Cell 1 [Member] Central CA Fuel Cell 1 [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Business Combination, Consideration Transferred Business Combination, Consideration Transferred Accounts Payable, Related Parties Accounts Payable, Related Parties 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 Power Generation Capacity, Megawatts The generation capacity of the entity's power generation facilities as of the balance sheet date, expressed in megawatts. Power Purchase Agreement Period Power Purchase Agreement Period Represents the period of power purchase agreement Condensed Cash Flow Statement [Table] Condensed Cash Flow Statement [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Eliminations Consolidation, Eliminations [Member] Clearway Energy LLC Clearway Energy LLC [Member] Clearway Energy LLC [Member] Clearway Energy Operating LLC Clearway Energy Operating LLC [Member] Clearway Energy Operating LLC [Member] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Guarantor Subsidiaries [Member] Guarantor Subsidiaries [Member] Non-Guarantor Subsidiaries [Member] Non-Guarantor Subsidiaries [Member] Subsidiary Issuer [Member] Subsidiary Issuer [Member] Parent Company [Member] Parent Company [Member] Condensed Cash Flow Statements, Captions [Line Items] Condensed Cash Flow Statements, Captions [Line Items] Net Cash Provided by (Used in) Operating Activities Net Cash Provided by (Used in) Operating Activities Intercompany transactions between Clearway Energy LLC and subsidiaries Intercompany (Payments to) Receipts from Consolidated Subsidiaries Intercompany (Payments to) Receipts from Consolidated Subsidiaries Acquisition of the Buckthorn Solar Drop Down Asset 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 Other Payments for (Proceeds from) Other Investing Activities Net Cash Used in Investing Activities Net Cash Provided by (Used in) Investing Activities Transfer of funds under intercompany cash management arrangement Proceeds from Payments to Intercompany Loans The cash inflow or outflow associated with intercompany loans for related parties. Net contributions from noncontrolling interests Proceeds from (Payments to) Noncontrolling Interests (Payments of) proceeds from distributions Payments of (Proceeds from) distributions Payments of (Proceeds from) distributions Proceeds from the revolving credit facility Proceeds from Lines of Credit Proceeds from the issuance of long-term debt — external Proceeds from Issuance of Long-term Debt Payments for long-term debt — external 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), Including 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 Business Acquisitions Mergers, Acquisitions and Dispositions Disclosures [Text Block] Debt Disclosure [Abstract] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] London Interbank Offered Rate (LIBOR) [Member] London Interbank Offered Rate (LIBOR) [Member] 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] Intercompany Credit Agreement due 2019 [Member] Intercompany Credit Agreement due 2019 [Member] Intercompany Credit Agreement due 2019 [Member] Intercompany Credit Agreement due 2020 [Member] Intercompany Credit Agreement due 2020 [Member] Intercompany Credit Agreement due 2020 [Member] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Agua Caliente Borrower 2 [Member] Agua Caliente Borrower 2 [Member] Agua Caliente Borrower 2 [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 Financing Agreement [Member] 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 [Member] El Segundo Energy Center, due 2023 [Member] El Segundo Energy Center, due 2023 [Member] El Segundo Energy Center, due 2023 Tranche B [Member] El Segundo Energy Center, due 2023 Tranche B [Member] El Segundo Energy Center, due 2023 Tranche B [Member] El Segundo Energy Center, 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 [Member] Energy Center Minneapolis Series C Notes [Member] Energy Center Minneapolis Series C 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] Kansas South, due in 2030 [Member] Kansas South, due in 2030 [Member] Kansas South, due in 2030 [Member] Marsh Landing Term Loan Facility [Member] Marsh Landing Term Loan Facility [Member] Marsh Landing Term Loan Facility [Member] Oahu Solar Holdings LLC, due 2026 [Member] Oahu Solar Holdings LLC, due 2026 [Member] Oahu Solar Holdings LLC, due 2026 [Member] South Trent Wind Due 2020 [Member] South Trent Wind Due 2020 [Member] South Trent Wind Due 2020 [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 Level Debt [Member] Project Level Debt [Member] Project Level Debt [Member] Long-term debt — affiliate Due to Affiliate, Noncurrent Long-term Debt Long-term Debt Current portion of long-term debt — external Long-term Debt and Capital Lease Obligations, Current Deferred Finance Costs, Net Debt Issuance Costs, Net Long-term Debt, Excluding Current Maturities Long-term Debt, Excluding Current Maturities Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Letters of Credit Outstanding, Amount Letters of Credit Outstanding, Amount 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 Nature of Business Disclosure [Abstract] -- None. No documentation exists for this element. -- Company Structure Company Organization Chart [Table Text Block] Company Organization Chart [Table Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest Rate Contract [Member] Interest Rate Contract [Member] Energy Related Derivative [Member] Energy Related Derivative [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Interest Expense [Member] Interest Expense [Member] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Unrealized Gain (Loss) on Derivatives Unrealized Gain (Loss) on Derivatives Derivative, Loss on Derivative Derivative, Loss on Derivative Equity Method Investments and Joint Ventures [Abstract] Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Consolidated Entities [Member] Consolidated Entities [Member] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] Entities that are not consolidated [Member] Entities that are not consolidated [Member] Entities that are not consolidated [Member] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Schedule of Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Alta X and XI TE Holdco [Member] Alta X and XI TE Holdco [Member] Alta X and XI TE Holdco [Member] Spring Canyon [Member] Spring Canyon [Member] Spring Canyon [Member] Buckthorn Solar Drop Down Asset [Member] Buckthorn Solar Drop Down Asset [Member] Buckthorn Solar Drop Down Asset [Member] Repowering Partnership LLC [Member] Repowering Partnership LLC [Member] Repowering Partnership LLC [Member] Oahu Solar Partnership [Member] Oahu Solar Partnership [Member] Oahu Solar Partnership [Member] Other Assets Other Assets Net property, plant and equipment Property, Plant and Equipment, Net Intangible assets, net Finite-Lived Intangible Assets, Net Total Assets Assets Total Liabilities Liabilities Noncontrolling Interest in Variable Interest Entity Noncontrolling Interest in Variable Interest Entity Net Assets Net Assets Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Energy Revenue [Member] Energy Revenue [Member] Energy Revenue [Member] Capacity Revenue [Member] Capacity Revenue [Member] Capacity Revenue [Member] Products And Services, Other [Member] Products And Services, Other [Member] Products And Services, Other [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Conventional Generation [Member] Conventional Generation [Member] Conventional Generation [Member] Renewables Renewables [Member] Renewables [Member] Operating Lease, Lease Income Operating Lease, Lease Income Revenue from Contract with Customer, Excluding Assessed Tax Revenue from Contract with Customer, Excluding Assessed Tax Contract amortization Capitalized Contract Cost, Amortization Mark-to-market for economic hedging activities Revenue, Mark-to-market Hedging Activities Revenue, Mark-to-market Hedging Activities Total operating revenues Revenues Less: Lease revenue Operating Leases, Income Statement, Lease Revenue Percentage of interest acquired Business Acquisition, Percentage of Voting Interests Acquired Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Net contributions from noncontrolling interests Proceeds from Noncontrolling Interests Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Business Segments [Axis] Corporate Corporate Segment [Member] Segment Reporting Segment Reporting Information [Line Items] Operating revenues Cost of operations Cost of Revenue Depreciation and amortization Depreciation, Depletion and Amortization General and administrative General and Administrative Expense Transaction and integration costs Business Combination, Acquisition Related Costs Development costs Costs Incurred, Development Costs Operating Income Operating Income (Loss) Equity in earnings of unconsolidated affiliates Income (Loss) from Equity Method Investments Other income, net Other Nonoperating Income (Expense) Interest expense Interest Expense Net (Loss) Income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Fair Value Disclosures [Abstract] 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] Reported Value Measurement [Member] Reported Value Measurement [Member] Estimate of Fair Value Measurement [Member] Estimate of Fair Value Measurement [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 2 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Long-term Debt and Capital Lease Obligations, Including Current Maturities Long-term Debt and Capital Lease Obligations, Including Current Maturities Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Schedule of Cash and Cash Equivalents Schedule of Cash and Cash Equivalents [Table Text Block] Schedule of Restricted Cash Restrictions on Cash and Cash Equivalents [Table Text Block] Schedule of Accumulated Depreciation and Amortization Schedule of Accumulated Depreciation and Amortization [Table Text Block] Schedule of Accumulated Depreciation and Amortization [Table Text Block] Distributions Made to Limited Liability Company (LLC) Member, by Distribution Distributions Made to Limited Liability Company (LLC) Member, by Distribution [Table Text Block] Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Contract Asset and Liability Contract with Customer, Asset and Liability [Table Text Block] Lessor, Lease, Description [Table] Lessor, Lease, Description [Table] Energy Revenue, Related to Leases [Member] Energy Revenue, Related to Leases [Member] Energy Revenue, Related to Leases [Member] Capacity Revenue, Related to Leases [Member] Capacity Revenue, Related to Leases [Member] Capacity Revenue, Related to Leases [Member] Revenue, Related to Leases [Member] Revenue, Related to Leases [Member] Revenue, Related to Leases [Member] Lessor, Lease, Description [Line Items] Lessor, Lease, Description [Line Items] Leases Lessor, Operating Leases [Text Block] Leases Lessee, Operating Leases [Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Solar Facilities [Member] Solar Facilities [Member] Solar Facilities [Member] Marsh Landing [Member] Marsh Landing [Member] Marsh Landing [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] 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] Fair Value Assets, Measured on Recurring Basis, 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. Number of Solar Leases in Portfolio Number of Solar Leases in Portfolio Number of Solar Leases in Portfolio Accounts Receivable, Related Parties Accounts Receivable, Related Parties Derivative [Table] Derivative [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Noncontrolling Interest Noncontrolling Interest [Member] Parent [Member] Parent [Member] Derivative [Line Items] Derivative [Line Items] Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of 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), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Losses expected to be realized from OCL during the next 12 months Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months 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 Accounts receivable — affiliate Due from Affiliate, Current Inventory Inventory, Net Prepayments and other current assets Prepaid Expense and Other Assets, Current Total current assets Assets, Current Property, plant and equipment, net Other Assets Assets, Noncurrent [Abstract] Equity investments in affiliates Equity Method Investments Intangible assets, net Derivative instruments Derivative Asset, Noncurrent Right of use assets, net Other non-current assets Other Assets, Noncurrent Total other assets LIABILITIES AND MEMBERS' EQUITY Liabilities and Equity [Abstract] Current Liabilities Liabilities, Current [Abstract] Current portion of long-term debt — external External Current Debt External Current Debt Current portion of long-term debt — affiliate Affiliate Current Debt Affiliate Current Debt Accounts payable — trade Accounts Payable, Current Accounts payable — affiliate Due to Affiliate, Current Derivative instruments Derivative Liability, Current Accrued interest expense Interest Payable Accrued expenses and other current liabilities Other Accrued Liabilities, Current Total current liabilities Liabilities, Current Other Liabilities Liabilities, Noncurrent [Abstract] Long-term debt — external Long-term Debt and Capital Lease Obligations Derivative instruments Derivative Liability, Noncurrent Long-term lease liabilities Operating Lease, Liability, Noncurrent Other non-current liabilities Other Liabilities, Noncurrent Total non-current liabilities Liabilities, Noncurrent Commitments and Contingencies Commitments and Contingencies Members' Equity Stockholders' Equity Attributable to Parent [Abstract] Contributed capital Members' Capital Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Noncontrolling interest Members' Equity Attributable to Noncontrolling Interest Total Members' Equity Limited Liability Company (LLC) Members' Equity, Including Portion Attributable to Noncontrolling Interest Total Liabilities and Members’ Equity Liabilities and Equity Condensed Consolidating Financial Information Condensed Financial Statements [Text Block] Estimated carrying values and fair values of the Company's recorded financial instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Fair Value Option, Disclosures Fair Value Option, Disclosures [Table Text Block] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Fair Value Measurement Inputs and Valuation Techniques Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Related Party Transactions [Abstract] Related Party Transactions Disclosure Related Party Transactions Disclosure [Text Block] Remainder of 2019 Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 2020 Lessee, Operating Lease, Liability, Payments, Due Year Two 2021 Lessee, Operating Lease, Liability, Payments, Due Year Three 2022 Lessee, Operating Lease, Liability, Payments, Due Year Four 2023 Lessee, Operating Lease, Liability, Payments, Due Year Five Thereafter Lessee, Operating Lease, Liability, Payments, Due after Year Five Total lease payments Lessee, Operating Lease, Liability, Payments, Due Less imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Total lease liability Document And Entity Information [Abstract] -- None. No documentation exists for this element. -- Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Class A [Member] Common Class A [Member] Common Class B [Member] Common Class B [Member] Common Class C [Member] Common Class C [Member] Common Class D [Member] Common Class D [Member] Common Class D [Member] Class of Stock [Line Items] Class of Stock [Line Items] 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 Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business 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] Natural Gas [Member] Natural Gas [Member] Interest [Member] Interest [Member] Details pertaining to interest rate swaps which are considered a derivative commodity. Commodity Contract [Member] Commodity Contract [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. Commodity Contract Non Current [Member] Commodity Contract Non Current [Member] The noncurrent 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] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Derivative Asset, Fair Value, Gross Asset Derivative Asset, Fair Value, Gross Asset Derivative, Notional Amount Derivative, Notional Amount Derivative Liability, Fair Value, Gross Liability Derivative Liability, Fair Value, Gross Liability Derivative, Collateral, Right to Reclaim Cash Derivative, Collateral, Right to Reclaim Cash Derivative, Collateral, Obligation to Return Cash Derivative, Collateral, Obligation to Return Cash Derivative Asset, Fair Value, Gross Liability Derivative Asset, Fair Value, Gross Liability Derivative Asset Derivative Asset Derivative Liability, Fair Value, Gross Asset Derivative Liability, Fair Value, Gross 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 Income Statement [Abstract] Operating Revenues Revenues [Abstract] Operating Costs and Expenses Operating Costs and Expenses [Abstract] Total operating costs and expenses Costs and Expenses Other Income (Expense) Costs and Expenses [Abstract] Interest expense Total other income (expense), net Nonoperating Income (Expense) Less: Loss attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Net Income Attributable to Clearway Energy LLC Net Income (Loss) Attributable to Parent Accounting for Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities 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 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. Changes in derivative instruments Increase (Decrease) in Derivative Assets and Liabilities 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 Cash Flows from Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Acquisition of interest in Oahu Partnership Payments to Acquire Businesses, Net of Cash Acquired Acquisition of the Buckthorn Solar Drop Down Asset Buyout of Wind TE Holdco noncontrolling interest Payments to Acquire Interest in Subsidiaries and Affiliates Cash Flows from Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Payments of distributions Payments of Dividends Payments for long-term debt — affiliate Repayments of Related Party Debt Nature of Business Business Description and Basis of Presentation [Text Block] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Contributed Capital Additional Paid-in Capital [Member] Accumulated Deficit Retained Earnings [Member] Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] Clearway Energy, Inc. Clearway Energy, Inc. [Member] Clearway Energy, Inc. [Member] Statement Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance, beginning of period Net income (loss) Unrealized (loss) gain on derivatives Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax Buyout of Wind TE Holdco noncontrolling interest Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Payment for the Buckthorn Solar Drop Down Asset Adjustment To Additional Paid In Capital, Payment To Acquire Business Under Common Control Adjustment To Additional Paid In Capital, Payment To Acquire Business Under Common Control Contributions from CEG for Oahu Partnership, non-cash Adjustments To Additional Paid In Capital, Distributions Paid Non-Cash, Net Of Contributions Adjustments To Additional Paid In Capital, Distributions Paid Non-Cash, Net Of Contributions Distributions paid to NRG, net of contributions Adjustments To Additional Paid In Capital, Distributions And Return Of Capital, Net Of Cash Contributions Adjustments To Additional Paid In Capital, Distributions And Return Of Capital, Net Of Cash Contributions Cumulative effect from change in accounting principle Cumulative Effect of New Accounting Principle in Period of Adoption Capital contributions from tax equity investors, net of distributions Noncontrolling Interest, Increase from Subsidiary Equity Issuance Distributions paid Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Paid Balance, end of period Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Derivative Assets (Liabilities), at Fair Value, Net Derivative Assets (Liabilities), at Fair Value, Net Derivative Liability, Fair Value, Gross Liability Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] Beginning balance as of January 1, 2019 Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs Purchases Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases Ending balance as of March 31, 2019 Condensed Income Statement [Table] Condensed Income Statement [Table] Clearway Energy LLC Condensed Income Statements, Captions [Line Items] Condensed Income Statements, Captions [Line Items] Depreciation and amortization Impairment losses Asset Impairment Charges Acquisition-related transaction and integration costs Equity in earnings (losses) of consolidated affiliates Equity in Earnings of Consolidated Subsidiaries This item represents the proportionate share of the parent in the earnings of the consolidated subsidiaries. Other income, net Gain (Loss) on Extinguishment of Debt Gain (Loss) on Extinguishment of Debt Investments Accounted for by the Equity Method and Variable Interest Entities Equity Method Investments and Joint Ventures Disclosure [Text Block] Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statements, Captions [Line Items] Condensed Balance Sheet Statements, Captions [Line Items] Cash and cash equivalents Investment in consolidated subsidiaries Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Current Liabilities Condensed Statement of Comprehensive Income [Table] Condensed Statement of Comprehensive Income [Table] Condensed Statement of Income Captions [Line Items] Condensed Statement of Income Captions [Line Items] Other comprehensive (loss) gain Other Comprehensive Income (Loss), Net of Tax Comprehensive (Loss) Income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Less: Comprehensive loss attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive (Loss) Income Attributable to Clearway Energy LLC Comprehensive Income (Loss), Net of Tax, Attributable to Parent Condensed Income Statement Condensed Income Statement [Table Text Block] Condensed Statement of Comprehensive Income Condensed Statement of Comprehensive Income [Table Text Block] Condensed Balance Sheet Condensed Balance Sheet [Table Text Block] Condensed Cash Flow Statement Condensed Cash Flow Statement [Table Text Block] Long-term Debt Long-term Debt [Text Block] Weighted Average [Member] Weighted Average [Member] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Derivative Asset Derivative Liability Schedule of long-term debt Schedule of Debt [Table Text Block] Zephyr Oahu Partnership LLC [Member] Zephyr Oahu Partnership LLC [Member] Zephyr Oahu Partnership LLC [Member] 3.5% Convertible Notes due 2019 [Member] 3.5% Convertible Notes due 2019 [Member] 3.5% Convertible Notes due 2019 [Member] Oahu Solar Holdings LLC Debt [Member] Oahu Solar Holdings LLC Debt [Member] Oahu Solar Holdings LLC Debt [Member] Derivative, Basis Spread on Variable Rate Derivative, Basis Spread on Variable Rate Line of Credit Facility, Fair Value of Amount Outstanding Line of Credit Facility, Fair Value of Amount Outstanding Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt Due to Affiliate, Noncurrent Repayments of Debt Repayments of Debt Short-term lease liability - operating leases Operating Lease, Liability, Current Long-term lease liability - operating leases Cash paid for operating leases Operating Lease, Payments Weighted average remaining lease term (in years) Operating Lease, Weighted Average Remaining Lease Term Nature of Business [Table] Nature of Business [Table] Nature of Business [Table] Ownership [Axis] Ownership [Axis] Ownership [Domain] Ownership [Domain] CEG [Member] CEG [Member] CEG [Member] 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] Nature of Business Basis of Presentation [Line Items] Basis of Presentation [Line Items] 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 DGPV Holdco 1 [Member] DGPV Holdco 1 [Member] DGPV Holdco 1 [Member] DGPV Holdco 3 [Member] DGPV Holdco 3 [Member] DGPV Holdco 3 [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] NRG DGPV Holdco 2 [Member] NRG DGPV Holdco 2 [Member] NRG DGPV Holdco 2 [Member] Gen Conn Energy LLC [Member] Gen Conn Energy LLC [Member] Represents the information pertaining to GenConn Energy LLC. RPV Holdco [Member] RPV Holdco [Member] RPV Holdco [Member] Payments to Acquire Equity Method Investments Payments to Acquire Equity Method Investments Due to Affiliate Due to Affiliate Remaining Lease Term Remaining Lease Term Remaining Lease Term Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Restricted cash Restricted Cash Cash, cash equivalents and restricted cash shown in the statement of cash flows Power [Member] Power [Member] Details pertaining to the power, which is considered as a derivative commodity. Derivative, Nonmonetary Notional Amount, Energy Measure Derivative, Nonmonetary Notional Amount, Energy Measure Derivative, Notional Amount Remainder of 2019 Lessor, Operating Lease, Payments to be Received, Remainder of Fiscal Year 2020 Lessor, Operating Lease, Payments to be Received, Two Years 2021 Lessor, Operating Lease, Payments to be Received, Three Years 2022 Lessor, Operating Lease, Payments to be Received, Four Years 2023 Lessor, Operating Lease, Payments to be Received, Five Years Total lease payments Lessor, Operating Lease, Payments to be Received Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] 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 Yield [Member] NRG Yield [Member] NRG Yield [Member] Thermal [Member] RENOM [Member] RENOM [Member] RENOM [Member] Related Party Transaction Related Party Transaction [Line Items] Revenues Revenue from Related Parties Related Party Transaction, Expenses from Transactions with Related Party Related Party Transaction, Expenses from Transactions with Related Party Segment Reporting Segment Reporting Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] Contingencies Contingencies Disclosure [Text Block] Lease Cost Lease, Cost [Table Text Block] Maturities of Operating Lease Liabilities Lessee, Operating Lease, Liability, Maturity [Table Text Block] Future Minimum Lease Commitments Under Operating Leases Lessee, Operating Lease, Disclosure [Table Text Block] Minimum Future Rent Payments under Operating Leases Lessor, Operating Lease, Payments to be Received, Maturity [Table Text Block] Operating lease cost Operating Lease, Cost Variable lease cost Variable Lease, Cost Total lease cost Lease, Cost Affiliated Entity [Member] Affiliated Entity [Member] Buckthorn Renewables, LLC [Member] Buckthorn Renewables, LLC [Member] Buckthorn Renewables, LLC [Member] Buckthorn Solar Portfolio, LLC [Member] Buckthorn Solar Portfolio, LLC [Member] Buckthorn Solar Portfolio, LLC [Member] Tax Equity Investors [Member] Tax Equity Investors [Member] Tax Equity Investors [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. Oahu Solar, Lanikuhana [Member] Oahu Solar, Lanikuhana [Member] Oahu Solar, Lanikuhana [Member] Oahu Solar, Waipio [Member] Oahu Solar, Waipio [Member] Oahu Solar, Waipio [Member] Buckthorn Holdings, LLC [Member] Buckthorn Holdings, LLC [Member] Buckthorn Holdings, LLC [Member] November 2015 Drop Down Assets [Member] November 2015 Drop Down Assets [Member] November 2015 Drop Down Assets [Member] Payments to Acquire Businesses, Gross Payments to Acquire Businesses, Gross Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest Business Combination, Capital Contribution, Percent Business Combination, Capital Contribution, Percent Business Combination, Capital Contribution, Percent Business Combination, Capital Contribution Payable, Percent Business Combination, Capital Contribution Payable, Percent Business Combination, Capital Contribution Payable, Percent Percentage of Cash Available for Distributions Percentage of Cash Available for Distributions Percentage of Cash Available for Distributions Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Stockholders' Equity Attributable to Noncontrolling Interest Stockholders' Equity Attributable to Noncontrolling Interest 2019 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2020 Operating Leases, Future Minimum Payments, Due in Two Years 2021 Operating Leases, Future Minimum Payments, Due in Three Years 2022 Operating Leases, Future Minimum Payments, Due in Four Years 2023 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total lease payments Operating Leases, Future Minimum Payments Due Current portion of long-term debt — external Summary of Significant Accounting Policies [Table] Summary of Significant Accounting Policies [Table] Summary of Significant Accounting Policies [Table] Purpose [Axis] Purpose [Axis] Purpose [Axis] Purpose [Domain] Purpose [Domain] [Domain] for Purpose [Axis] Operating Funds [Member] Operating Funds [Member] Operating Funds [Member] Long-Term Debt, Current [Member] Long-Term Debt, Current [Member] Long-Term Debt, Current [Member] Debt Service Obligations [Member] Debt Service Obligations [Member] Debt Service Obligations [Member] Cash Distribution [Member] Cash Distribution [Member] Subsidiaries Affected By Bankruptcy [Member] Subsidiaries Affected By Bankruptcy [Member] Subsidiaries Affected By Bankruptcy [Member] Project Level Subsidiaries [Member] Project Level Subsidiaries [Member] Project Level Subsidiaries [Member] Summary of Significant Accounting Policies [Line Items] Summary of Significant Accounting Policies [Line Items] [Line Items] for Summary of Significant Accounting Policies [Table] Restricted Cash and Cash Equivalents Restricted Cash and Cash Equivalents Other Cash Equivalents, at Carrying Value Other Cash Equivalents, at Carrying Value Contract amortization Operating Leases, Income Statement, Contingent Revenue Operating Leases, Income Statement, Contingent Revenue Members' Equity Attributable to Noncontrolling Interest Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Capital contributions from tax equity investors, net of distributions (a) Comprehensive loss 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 Dividends Per Class A Common Share Common Stock, Dividends, Per Share, Cash Paid Intangible assets, accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Statement of Comprehensive Income [Abstract] Other Comprehensive (Loss) Gain Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Segment Reporting Segment Reporting, Policy [Policy Text Block] Noncontrolling Interests Consolidation, Policy [Policy Text Block] Distributions Distributions [Policy Text Block] Distributions [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Revenue Recognition Revenue Recognition, Policy [Policy Text Block] Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Domain] Other Comprehensive Income Location [Domain] Property Subject to or Available for Operating Lease, by Major Property Class [Table] Property Subject to or Available for Operating Lease, by Major Property Class [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Assets Leased to Others [Member] Assets Leased to Others [Member] Property Subject to or Available for Operating Lease [Line Items] Property Subject to or Available for Operating Lease [Line Items] Property, plant and equipment Property, Plant and Equipment, Gross Accumulated depreciation Net property, plant and equipment 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]