Investments Accounted for by the Equity Method and Variable Interest Entities - Variable Interest Entities and Other Equity Investments (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) project MW	Dec. 31, 2020 USD ($)
Schedule of Equity Method Investments [Line Items]
Generation capacity (in MW) | MW	18,000
Equity investments in affiliates | $	$ 157	$ 346
Ivanpah Master Holdings LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage	54.50%
Number of solar electric generating projects | project	3
Generation capacity (in MW) | MW	393
Equity investments in affiliates | $	$ 4
Gladstone
Schedule of Equity Method Investments [Line Items]
Ownership percentage	37.50%
Generation capacity (in MW) | MW	1,613
Equity investments in affiliates | $	$ 127