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Acquisitions, Discontinued Operations and Dispositions - Discontinued Operations (Details) $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2018 USD ($) | Feb. 06, 2018 USD ($) extension | Dec. 31, 2018 USD ($) MW | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) MW | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Generation capacity (in MW) | MW |  |  | 23,000 |  |  |  |  |  |  |  | 23,000 |  |
Other non-current liabilities |  |  | $ 718 |  |  |  | $ 534 |  |  |  | $ 718 | $ 534 |
Loss from discontinued operations |  |  | $ (80) | $ 336 | $ (69) | $ 5 | $ 265 | $ 0 | $ 702 | $ 25 | $ 192 | 992 | $ (65)
NRG Yield Inc. And Zephyr Renewables | Agua Caliente Solar Project |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest prior to disposal | 5100.00% |  |  |  |  |  |  |  |  |  |  |  |
Remaining ownership interest | 3500.00% |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of equity interest | $ 8 |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations | South Central Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Generation capacity (in MW) | MW |  |  | 1,263 |  |  |  |  |  |  |  | 1,263 |  |
Loss from discontinued operations |  |  |  |  |  |  |  |  |  |  | $ (66) | (87) | (72)
Discontinued Operations | NRG Yield Inc. And Zephyr Renewables |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration | 1,348 |  |  |  |  |  |  |  |  |  |  |  |
Commitment and advisory fees | 50 |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations | NRG Yield Inc. And Zephyr Renewables | Scenario, Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Other non-current liabilities | $ (153) |  |  |  |  |  |  |  |  |  |  |  |
Loss from discontinued operations |  | $ 153 |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations | Carlsbad Energy Holdings LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  | 387 |  |  |  |  |  |  |  |  |  |  |
Other commitment |  | $ 23 |  |  |  |  |  |  |  |  |  |  |
Loss from discontinued operations |  |  |  |  |  |  |  |  |  |  | $ 292 | $ 290 | $ 99
Membership percentage |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Lease and easement agreement, number of extensions | extension |  | 2 |  |  |  |  |  |  |  |  |  |  |
Renewal term |  | 10 years |  |  |  |  |  |  |  |  |  |  |

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