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Goodwill and Other Intangible Assets (Intangible Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets, Net [Abstract]    
Gross Balance $ 707 $ 847
Accumulated Amortization (307) (457)
Net Balance 400 390
Indefinite-lived Intangible Assets (Excluding Goodwill) 69 46
Indefinite- lived intangible assets, Amortization 0 0
Intangible Assets, Gross 776 893
Intangible Assets, Net 469 436
Land Use Rights [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Indefinite-lived Intangible Assets (Excluding Goodwill) 21 21
Indefinite- lived intangible assets, Amortization 0 0
Water rights    
Finite-Lived Intangible Assets, Net [Abstract]    
Indefinite-lived Intangible Assets (Excluding Goodwill) 20 20
Indefinite- lived intangible assets, Amortization 0 0
Transmission Rights [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Indefinite-lived Intangible Assets (Excluding Goodwill) 23 0
Indefinite- lived intangible assets, Amortization 0 0
Other    
Finite-Lived Intangible Assets, Net [Abstract]    
Indefinite-lived Intangible Assets (Excluding Goodwill) 5 5
Indefinite- lived intangible assets, Amortization 0 0
Computer Software, Intangible Asset [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross Balance 367 467
Accumulated Amortization (228) (344)
Net Balance 139 123
Contractual payment rights    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross Balance 0 57
Accumulated Amortization 0 (44)
Net Balance [1] 0 13
Emission allowances [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross Balance 24 15
Accumulated Amortization 0 0
Net Balance [2] 24 15
Project Development Rights [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross Balance 100 93
Accumulated Amortization (1) (1)
Net Balance 99 92
Contracts    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross Balance 134 137
Accumulated Amortization (29) (24)
Net Balance 105 113
Other    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross Balance 82 78
Accumulated Amortization (49) (44)
Net Balance [3] $ 33 $ 34
[1]
Represent legal rights to receive system reliability payments from the regulator.
[2] 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, sales concessions, renewable energy credits and incentives, and other individually insignificant intangible assets.