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Acquisitions, Discontinued Operations and Dispositions - Sale of Assets Prior to Discontinued (Details) $ in Millions	Dec. 31, 2020 MW	Jan. 31, 2019 USD ($)	Jun. 19, 2018 USD ($)	Mar. 30, 2018 USD ($) MW
Business Acquisition [Line Items]
Generation capacity (in MW) | MW	23,000
UPMC Thermal Project
Business Acquisition [Line Items]
Cash consideration		$ 3	$ 84
Buckthorn Renewables, LLC
Business Acquisition [Line Items]
Cash consideration				$ 42
Percentage of ownership sold				10000.00%
Generation capacity (in MW) | MW				154
Debt assumed				$ 183

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