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Acquisitions, Discontinued Operations and Dispositions - Discontinued Operations (Details) $ in Millions	Feb. 06, 2018 USD ($) extension	Dec. 31, 2020 USD ($) MW	Dec. 31, 2019 USD ($)	Feb. 04, 2019 USD ($) MW	Aug. 31, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Generation capacity (in MW) | MW		23,000
Discontinued Operations | South Central Portfolio
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash consideration				$ 1,000
Generation capacity (in MW) | MW				1,153
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
Discontinued Operations | NRG Yield Inc. And Zephyr Renewables | Cost To Complete Construction
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other commitment			$ 15
Discontinued Operations | NRG Yield Inc. And Zephyr Renewables | Property Taxes For Solar Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other commitment			22
Discontinued Operations | Carlsbad Energy Holdings LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash consideration	$ 385
Other commitment		$ 23	$ 23
Membership percentage	100.00%
Lease and easement agreement, number of extensions | extension	2
Renewal term	10 years

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980

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