Intangibles (Schedule of Intangibles) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Retirement of Intangibles		$ (76)	$ (172)
Purchases of Intangible Assets		70	98
Sales and Transfers of Intangible Assets	[1]		(63)
Impairments			(1)
Intangible Assets		14	20	$ 158
Renewable Energy Credits [Member]
Goodwill [Line Items]
Retirement of Intangibles		(76)	(114)
Purchases of Intangible Assets		70	89
Sales and Transfers of Intangible Assets	[1]		(1)
Impairments			0
Intangible Assets		14	20	46
Emissions Allowances [Member]
Goodwill [Line Items]
Retirement of Intangibles		0	(58)
Purchases of Intangible Assets		0	9
Sales and Transfers of Intangible Assets	[1]		(62)
Impairments			(1)
Intangible Assets		$ 0	0	$ 112
Transfer to Assets Held for Sale			$ 52

[1] Includes $52 million classified as Assets Held for Sale. See Note 4. Early Plant Retirements/Asset Dispositions and Impairments.