Goodwill and Other Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets, Net [Abstract]
Gross Balance		$ 2,216	$ 1,783
Accumulated Amortization		(434)	(385)
Net Balance		1,782	1,398
Indefinite-lived Intangible Assets (Excluding Goodwill)		59	52
Indefinite- lived intangible assets, Amortization		0	0
Intangible Assets, Gross		2,275	1,835
Intangible Assets, Net		1,841	1,450
Land Use Rights [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Indefinite-lived Intangible Assets (Excluding Goodwill)		42	28
Indefinite- lived intangible assets, Amortization		0	0
Water rights
Finite-Lived Intangible Assets, Net [Abstract]
Indefinite-lived Intangible Assets (Excluding Goodwill)		0	3
Indefinite- lived intangible assets, Amortization		0	0
Transmission Rights [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Indefinite-lived Intangible Assets (Excluding Goodwill)		16	19
Indefinite- lived intangible assets, Amortization		0	0
Other
Finite-Lived Intangible Assets, Net [Abstract]
Indefinite-lived Intangible Assets (Excluding Goodwill)		1	2
Indefinite- lived intangible assets, Amortization		0	0
Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross Balance		582	457
Accumulated Amortization		(307)	(279)
Net Balance		275	178
Emission allowances [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross Balance		37	18
Accumulated Amortization		0	0
Net Balance		37	18
Project Development Rights [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross Balance		991	819
Accumulated Amortization		(17)	(8)
Net Balance		974	811
Contracts
Finite-Lived Intangible Assets, Net [Abstract]
Gross Balance		342	183
Accumulated Amortization		(40)	(48)
Net Balance		302	135
Other
Finite-Lived Intangible Assets, Net [Abstract]
Gross Balance		57	111
Accumulated Amortization		(20)	(17)
Net Balance	[1]	37	94
Compensation from Concession Agreement
Finite-Lived Intangible Assets, Net [Abstract]
Gross Balance		207	195
Accumulated Amortization		(50)	(33)
Net Balance		$ 157	$ 162

[1] Acquired or purchased emissions allowances are finite-lived intangible assets that are expensed when utilized and included in net income for the year. (3)Includes management rights, renewable energy credits and incentives, and other individually insignificant intangible assets.