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Acquisitions, Discontinued Operations and Dispositions - Dispositions (Details) $ in Millions |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Nov. 01, 2018 USD ($) MW | Aug. 01, 2018 USD ($) | Jun. 29, 2018 USD ($) | Jun. 28, 2018 USD ($) | Dec. 31, 2018 USD ($) MW | Dec. 31, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Generation capacity (in MW) | MW |  |  |  |  | 23,000 |
Parent guarantee |  |  |  |  | $ 2,767 | $ 1,960
Other guarantees |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Parent guarantee |  |  |  |  | 721 | $ 645
Agua Caliente Borrower 1, LLC | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from sale of ownership interest | $ 120 |  |  |  |  |
Generation capacity (in MW) | MW | 290 |  |  |  |  |
BETM | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Percentage of ownership sold |  | 100.00% |  |  |  |
Proceeds from sale of businesses, net of working capital adjustments |  | $ 71 |  |  |  |
Gain on sale of business |  | 15 |  |  |  |
Cash collateral |  | 4 |  |  |  |
BETM | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Letter of Credit |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Parent guarantee |  | 119 |  |  |  |
BETM | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Other guarantees |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Parent guarantee |  | $ 32 |  |  |  |
Canal Three | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain on sale of business |  |  | $ 17 |  |  |
Cash received |  |  | $ 16 |  |  |
Cash proceeds |  |  |  | $ 167 |  |
Proceeds distributed to Company |  |  |  | $ 151 |  |
Other | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Cash received |  |  |  |  | $ 28 |
Clearway Energy, Inc. | Agua Caliente Borrower 1, LLC | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Ownership interest | 35.00% |  |  |  |  |

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