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Long-term Debt - Debt Disclosures (Details) - USD ($) $ in Millions |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 02, 2020 | Sep. 30, 2020 | Sep. 01, 2020 | Jun. 01, 2020 | May 21, 2020 | Jan. 03, 2020 | Feb. 29, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from the revolving credit facility |  |  |  |  |  |  |  |  |  |  | $ 265.0 | $ 22.0
Payments for the revolving credit facility |  |  |  |  |  |  |  |  |  |  | 265.0 | 22.0
Loss on debt extinguishment |  |  |  |  |  |  |  | $ 6.0 | $ 0.0 |  | 9.0 | $ 1.0
Distributions |  |  |  |  |  |  |  |  | $ 4.0 | $ 30.0 |  |
DG-CS Master Borrower LLC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unwind related to derivatives | $ 42.0 |  |  |  |  |  |  |  |  |  |  |
Clearway Energy LLC and Clearway Energy Operating LLC Revolving Credit Facility, due 2023 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from the revolving credit facility |  |  |  |  |  |  |  |  |  |  | 265.0 |
Payments for the revolving credit facility |  |  |  |  |  |  |  |  |  |  | $ 265.0 |
Clearway Energy LLC and Clearway Energy Operating LLC Revolving Credit Facility, due 2023 | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  |  |  |  |  |  | 2.00% |
2024 Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  | 5.375% |  |  |  |  |  | 5.375% |  |  | 5.375% |
Construction Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  | $ 260.0 |  |  |  |  |
CS4 Borrower, due 2026 | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  |  |  |  |  |  | 2.00% |
CS4 Borrower, due 2026 | LIBOR | Renew CS4 Borrower LLC |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  |  |  | 2.00% |  |  |  |
CS4 Borrower, due 2026 | Conversion period one | Renew CS4 Borrower LLC |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  | 2.00% |  |  |  |  |  | 2.00% |  |  | 2.00% |
CS4 Borrower, due 2026 | Conversion period two | Renew CS4 Borrower LLC |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  | 2.25% |  |  |  |  |  | 2.25% |  |  | 2.25% |
Chestnut Borrower, LLC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | 107.0 |  |  |  |  |  |  |  |  |  |  |
Renew Solar CS 4 Borrower LLC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | 102.0 |  |  |  |  |  |  |  |  |  |  |
DGPV 4 Borrower LLC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | 92.0 |  |  |  |  |  |  |  |  |  |  |
Puma Class B LLC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | $ 73.0 |  |  |  |  |  |  |  |  |  |  |
Utah Solar Holdings, due 2036 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  |  |  |  |  |  | 3.59% |
DG-CS Master Borrower LLC Financing Arrangement | DG-CS Master Borrower LLC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 3.51% |  |  |  |  |  |  |  |  |  |  |
Letter of Credit | Clearway Energy LLC and Clearway Energy Operating LLC Revolving Credit Facility, due 2023 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  | $ 59.0 |  |  |  |  |  | $ 59.0 |  |  | $ 59.0 |
Letter of Credit | CS4 Borrower, due 2026 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  | 4.0 |  |  |  |  |  | 4.0 |  |  | 4.0 |
Letter of Credit | CS4 Borrower, due 2026 | Renew CS4 Borrower LLC |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt amount (up to) |  | 4.9 |  |  |  |  |  | 4.9 |  |  | 4.9 |
Letter of Credit | Chestnut Borrower credit agreement | Chestnut Borrower, LLC |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt amount (up to) |  | 7.9 |  |  |  |  |  | 7.9 |  |  | 7.9 |
Letter of Credit | Utah Solar Holdings, due 2036 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  | 9.0 |  |  |  |  |  | 9.0 |  |  | 9.0 |
Letter of Credit | Utah Solar Holdings, due 2036 | Utah Solar Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from the revolving credit facility |  |  | $ 16.0 |  |  |  |  |  |  |  |  |
Letter of Credit | DG-CS Master Borrower LLC Financing Arrangement | DG-CS Master Borrower LLC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from the revolving credit facility | $ 30.0 |  |  |  |  |  |  |  |  |  |  |
Letter of Credit | NIMH Solar LLC Financing Arrangement | NIMH Solar LLC |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from the revolving credit facility |  | 16.0 |  |  |  |  |  |  |  |  |  |
Construction loans | CS4 Borrower, due 2026 | Renew CS4 Borrower LLC |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt amount (up to) |  | 97.4 |  |  |  |  |  | 97.4 |  |  | 97.4 |
ITC bridge loan | CS4 Borrower, due 2026 | Renew CS4 Borrower LLC |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt amount (up to) |  | 89.9 |  |  |  |  |  | 89.9 |  |  | 89.9 |
Term loan | Chestnut Borrower credit agreement | Chestnut Borrower, LLC |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt amount (up to) |  | 120.3 |  |  |  |  |  | $ 120.3 |  |  | $ 120.3 |
Term loan | Chestnut Borrower credit agreement | Conversion period one | LIBOR | Chestnut Borrower, LLC |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  |  |  | 2.50% |  |  |  |
Term loan | Chestnut Borrower credit agreement | Conversion period two | LIBOR | Chestnut Borrower, LLC |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  |  |  | 2.75% |  |  |  |
Term loan | Project level debt | Alpine |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | 117.0 |  |  |  |  |  |  |  |  |  |
Term loan | Project level debt | Blythe |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | 14.0 |  |  |  |  |  |  |  |  |  |
Term loan | Project level debt | Roadrunner |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | 27.0 |  |  |  |  |  |  |  |  |  |
Term loan | DG-CS Master Borrower LLC Financing Arrangement | DG-CS Master Borrower LLC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from the revolving credit facility | $ 467.0 |  |  |  |  |  |  |  |  |  |  |
Term loan | NIMH Solar LLC Financing Arrangement | Affiliated Entity | Clearway Energy Operating LLC |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distributions |  | 45.0 |  |  |  |  |  |  |  |  |  |
Term loan | NIMH Solar LLC Financing Arrangement | NIMH Solar LLC |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from the revolving credit facility |  | $ 193.0 |  |  |  |  |  |  |  |  |  |
Term loan | NIMH Solar LLC Financing Arrangement | LIBOR | Through Third Party Anniversary of Closing |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  | 2.00% |  |  |  |  |  | 2.00% |  |  | 2.00% |
Term loan | NIMH Solar LLC Financing Arrangement | LIBOR | After Third Party Anniversary of Closing |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  | 2.125% |  |  |  |  |  | 2.125% |  |  | 2.125% |
Senior Notes | 2024 Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  |  |  |  |  | 102.70% |  |  |  |  |  |
Debt instrument, repurchased face amount |  |  |  |  |  | $ 88.0 |  |  |  |  |  |
Debt instrument, repurchase amount |  |  |  |  |  | 90.0 |  |  |  |  |  |
Loss on debt extinguishment |  |  |  |  |  | $ (3.0) |  |  |  |  |  |
Senior Notes | 4.75% Senior Notes due in 2028 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt amount (up to) |  |  |  |  | $ 250.0 |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  | 4.75% |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  |  |  |  | 102.00% |  |  |  |  |  |  |
Repayment of outstanding principal amount |  |  |  | $ 45.0 |  |  |  |  |  |  |  |
Senior Notes | Utah Solar Holdings, due 2036 | Utah Solar Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from the revolving credit facility |  |  | $ 296.0 |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  | 3.59% |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 247.0 |  |  |  |  |  |  |  |  |
Unwind related to derivatives |  |  | 33.0 |  |  |  |  |  |  |  |  |
Senior Notes | Utah Solar Holdings, due 2036 | Utah Solar Holdings, LLC | Affiliated Entity | Clearway Energy Operating LLC |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distributions |  |  | $ 9.0 |  |  |  |  |  |  |  |  |

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