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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.

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