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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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