Goodwill and Other Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions		Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets, Net [Abstract]
Gross Balance		$ 1,783	$ 1,070
Accumulated Amortization		(385)	(330)
Net Balance		1,398	740
Indefinite-lived Intangible Assets (Excluding Goodwill)		52	87
Indefinite- lived intangible assets, Amortization		0	0
Intangible Assets, Gross		1,835	1,157
Intangible Assets, Net		1,450	827
Land Use Rights [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Indefinite-lived Intangible Assets (Excluding Goodwill)		28	39
Indefinite- lived intangible assets, Amortization		0	0
Water rights
Finite-Lived Intangible Assets, Net [Abstract]
Indefinite-lived Intangible Assets (Excluding Goodwill)		3	20
Indefinite- lived intangible assets, Amortization		0	0
Transmission Rights [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Indefinite-lived Intangible Assets (Excluding Goodwill)		19	22
Indefinite- lived intangible assets, Amortization		0	0
Other
Finite-Lived Intangible Assets, Net [Abstract]
Indefinite-lived Intangible Assets (Excluding Goodwill)		2	6
Indefinite- lived intangible assets, Amortization		0	0
Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross Balance		457	386
Accumulated Amortization		(279)	(255)
Net Balance		178	131
Emission allowances [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross Balance		18	64
Accumulated Amortization		0	0
Net Balance		18	64
Project Development Rights [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross Balance		819	203
Accumulated Amortization		(8)	(5)
Net Balance		811	198
Contracts
Finite-Lived Intangible Assets, Net [Abstract]
Gross Balance		183	157
Accumulated Amortization		(48)	(38)
Net Balance		135	119
Other
Finite-Lived Intangible Assets, Net [Abstract]
Gross Balance		111	59
Accumulated Amortization		(17)	(14)
Net Balance	[1]	94	45
Compensation from Concession Agreement
Finite-Lived Intangible Assets, Net [Abstract]
Gross Balance		195	201
Accumulated Amortization		(33)	(18)
Net Balance		$ 162	$ 183

[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.