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Investments Accounted for by the Equity Method and Variable Interest Entities - Unconsolidated Entities (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 01, 2020 USD ($) MW | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Investment of cash |  |  |  |  |  |  |  | $ 11 | $ 14 |
Adjustment to noncontrolling interest | $ 83 |  |  |  |  |  |  |  |  |
Equity investments in affiliates |  | $ 1,001 |  |  |  |  |  | 1,001 |  | $ 1,183
Operating revenues |  | 332 |  |  | $ 296 |  |  | 919 | 797 |
Operating income |  | 123 |  |  | 90 |  |  | 305 | 218 |
Net income (loss) |  | 42 | $ 76 | $ (107) | 35 | $ (36) | $ (47) | 11 | (48) |
Current assets |  | 773 |  |  |  |  |  | 773 |  | 608
Current liabilities |  | 602 |  |  |  |  |  | 602 |  | 2,057
Non-current liabilities |  | $ 6,886 |  |  |  |  |  | $ 6,886 |  | 5,380
Utah Solar Portfolio |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Economic Interest |  | 50.00% |  |  |  |  |  | 50.00% |  |
Equity investments in affiliates |  | $ 268 |  |  |  |  |  | $ 268 |  |
Desert Sunlight |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Economic Interest |  | 25.00% |  |  |  |  |  | 25.00% |  |
Equity investments in affiliates |  | $ 257 |  |  |  |  |  | $ 257 |  |
Agua Caliente Solar |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Economic Interest |  | 16.00% |  |  |  |  |  | 16.00% |  |
Equity investments in affiliates |  | $ 89 |  |  |  |  |  | $ 89 |  |
GenConn |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Economic Interest |  | 50.00% |  |  |  |  |  | 50.00% |  |
Equity investments in affiliates |  | $ 90 |  |  |  |  |  | $ 90 |  |
DGPV Holdco 1 LLC |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Economic Interest |  | 95.00% |  |  |  |  |  | 95.00% |  |
Equity investments in affiliates |  | $ 81 |  |  |  |  |  | $ 81 |  |
DGPV Holdco 2 LLC |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Economic Interest |  | 95.00% |  |  |  |  |  | 95.00% |  |
Equity investments in affiliates |  | $ 63 |  |  |  |  |  | $ 63 |  |
San Juan Mesa |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Economic Interest |  | 75.00% |  |  |  |  |  | 75.00% |  |
Equity investments in affiliates |  | $ 42 |  |  |  |  |  | $ 42 |  |
Elkhorn Ridge |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Economic Interest |  | 66.70% |  |  |  |  |  | 66.70% |  |
Equity investments in affiliates |  | $ 39 |  |  |  |  |  | $ 39 |  |
Avenal |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Economic Interest |  | 50.00% |  |  |  |  |  | 50.00% |  |
Equity investments in affiliates |  | $ (5) |  |  |  |  |  | $ (5) |  |
Mesquite Star |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Investment of cash | $ 79 |  |  |  |  |  |  |  |  |
Power generation capacity, megawatts | MW | 419 |  |  |  |  |  |  |  |  |
Weighted average remaining contract life | 12 years |  |  |  |  |  |  |  |  |
Economic Interest |  | 50.00% |  |  |  |  |  | 50.00% |  |
Equity investments in affiliates |  | $ 77 |  |  |  |  |  | $ 77 |  |
DGPV Holdco 3 |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Operating revenues |  | 0 |  |  | 9 |  |  | 14 | 22 |
Operating income |  | 0 |  |  | 6 |  |  | 6 | 11 |
Net income (loss) |  | 0 |  |  | $ 16 |  |  | (12) | $ 24 |
Current assets |  | 0 |  |  |  |  |  | 0 |  | 39
Non-current assets |  | 0 |  |  |  |  |  | 0 |  | 371
Current liabilities |  | 0 |  |  |  |  |  | 0 |  | 61
Non-current liabilities |  | 0 |  |  |  |  |  | 0 |  | 216
Redeemable noncontrolling interest |  | $ 0 |  |  |  |  |  | $ 0 |  | $ (1)

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