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Investments in Unconsolidated Affiliates (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) asset MW	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2019
Investments In Unconsolidated Affiliates [Line Items]
Distributions from equity investments	$ 37	$ 55	$ 108
Distributions from equity investments, return of capital	$ 133	11	137
Electric Utilities and Infrastructure \| DATC
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest	50.00%
Electric Utilities and Infrastructure \| Pioneer
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest	50.00%
Commercial Renewables \| Non-consolidated VIEs
Investments In Unconsolidated Affiliates [Line Items]
Number of cell projects \| asset	70
Capacity of assets \| MW	43
Commercial Renewables \| DS Cornerstone
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest	26.00%			50.00%
Other \| NMC
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest	17.50%
Board representation and voting rights, ownership percentage	25.00%
Piedmont
Investments In Unconsolidated Affiliates [Line Items]
Distributions from equity investments	$ 2	1	1
Distributions from equity investments, return of capital	$ 2	$ 4	$ 3