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Investments Accounted for by the Equity Method and Variable Interest Entities - Other Equity Investments (Details) $ in Millions | Dec. 31, 2018 USD ($) MW | Dec. 31, 2017 USD ($)
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Generation capacity (in MW) | MW | 23,000 |
Equity investments in affiliates | $ 412 | $ 182
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Current assets | 3 | 6
Net property, plant and equipment | 76 | 80
Other long-term assets | 28 | 36
Total assets | 107 | 122
Current liabilities | 2 | 3
Long-term debt | 29 | 30
Other long-term liabilities | 7 | 7
Total liabilities | 38 | 40
Redeemable noncontrolling interests | 19 | 19
Net assets less noncontrolling interests | $ 50 | $ 63
Gladstone |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership percentage | 37.50% |
Generation capacity (in MW) | MW | 1,613 |
Equity investments in affiliates | $ 140 |

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