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v3.20.4

Acquisitions, Discontinued Operations and Dispositions - Dispositions (Details) $ in Millions |  |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 13, 2020 USD ($) | Aug. 01, 2018 USD ($) | Jun. 29, 2018 USD ($) | Jun. 28, 2018 USD ($) | Dec. 31, 2021 USD ($) MW | Dec. 31, 2020 USD ($) MW | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) MW | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Nov. 19, 2020 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 |  |  |
Loss on debt extinguishment, net |  |  |  |  |  |  |  | $ (9) | $ (51) | $ (44) |
Parent guarantee |  |  |  |  |  | $ 1,746 |  | 1,746 | 2,010 |  |
Home Solar |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  | 66 |  |  |  |  |
Other guarantees |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Parent guarantee |  |  |  |  |  | $ 87 |  | 87 | 288 |  |
Agua Caliente Solar Project | 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 |  |  |  |  |  |  |  |  |  |  | 35.00%
Cash consideration |  |  |  |  |  |  |  |  |  |  | $ 202
Home Solar |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment loss |  |  |  |  |  |  | $ 29 |  |  |  |
Home Solar | 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 | $ 66 |  |  |  |  |  |  |  |  |  |
(Loss) gain on sale of business | (2) |  |  |  |  |  |  |  |  |  |
Debt extinguished | 27 |  |  |  |  |  |  |  |  |  |
Loss on debt extinguishment, net | $ 5 |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |
(Loss) gain on sale of business |  | $ 15 |  |  |  |  |  |  |  |  |
Proceeds from sale of businesses, net of working capital adjustments |  | 71 |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  | $ 16 |  |  |  |  |  |  |  |
(Loss) gain on sale of business |  |  | $ 17 |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  |  |  | $ 15 | $ 22 |  |
Subsequent Event | Scenario, Forecast | East/West Other |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Generation capacity (in MW) | MW |  |  |  |  | 4,850 |  |  |  |  |  |
Proceeds from sale |  |  |  |  | $ 760 |  |  |  |  |  |
Subsequent Event | Scenario, Forecast | East/West Other | Arthur Kill Plant |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Generation capacity (in MW) | MW |  |  |  |  | 866 |  |  |  |  |  |

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