Investments in Unconsolidated Affiliates (Investments in Equity Method Unconsolidated Affiliates) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investments In Unconsolidated Affiliates [Line Items]
Investments	$ 970	$ 961
Equity in earnings (losses) of unconsolidated affiliates	28	(2,005)	$ 162
Electric Utilities and Infrastructure
Investments In Unconsolidated Affiliates [Line Items]
Investments	104	105
Equity in earnings (losses) of unconsolidated affiliates	7	(1)	9
Gas Utilities and Infrastructure
Investments In Unconsolidated Affiliates [Line Items]
Investments	231	215
Equity in earnings (losses) of unconsolidated affiliates	8	(2,017)	114
Commercial Renewables
Investments In Unconsolidated Affiliates [Line Items]
Investments	513	534
Equity in earnings (losses) of unconsolidated affiliates	(34)		(4)
Other
Investments In Unconsolidated Affiliates [Line Items]
Investments	122	107
Equity in earnings (losses) of unconsolidated affiliates	$ 47	$ 13	$ 43