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Investments Accounted for by the Equity Method and Variable Interest Entities - Repowering Partnership II LLC (Details) - USD ($) $ in Millions |  | 2 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 11, 2020 | Mar. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | Feb. 07, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Removal of related noncontrolling interest balance | $ 8 |  |  |  | $ 19 |  |  |  |
Allocations of taxable income (as a percentage) |  |  |  |  |  |  |  |  | 99.00%
Loss attributable to noncontrolling interests |  |  | $ 10 | $ (4) |  |  | $ (43) |  |
Wildorado TE Holdco |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Business combination, consideration transferred |  | $ 112 |  |  |  |  |  |  |
Allocations of taxable income after (as a percentage) |  |  |  |  |  |  |  |  | 5.00%
Wildorado TE Holdco | Repowering Partnership II LLC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Loss attributable to noncontrolling interests |  |  |  |  |  | $ (36) |  |  |
Wildorado TE Holdco | Capital Unit, Class A | Third Party Investor |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired |  |  |  |  |  |  |  |  | 100.00%
Acquired membership interests |  |  |  |  |  |  |  |  | $ 148
Wind TE Holdco LLC | Repowering Partnership II LLC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Allocations of taxable income after (as a percentage) |  |  |  |  |  |  |  | 60.14% |
CWSP Wildorado Elbow Holding LLC | Repowering Partnership II LLC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Allocations of taxable income after (as a percentage) |  |  |  |  |  |  |  | 39.86% |
Repowering Partnership II LLC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Cash consideration | $ 70 |  |  |  |  |  |  |  |
Elbow Creek TE Holdco | Repowering Partnership II LLC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Loss attributable to noncontrolling interests |  |  | $ (1) |  |  | $ (9) |  |  |

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