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Goodwill and Other Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance |  | $ 847 | $ 728
Accumulated Amortization |  | (457) | (441)
Net Balance |  | 390 | 287
Indefinite-lived Intangible Assets (Excluding Goodwill) |  | 46 | 79
Indefinite- lived intangible assets, Amortization |  | 0 | 0
Intangible Assets, Gross |  | 893 | 807
Intangible Assets, Net |  | 436 | 366
Land Use Rights [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) |  | 21 | 45
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
Other |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) |  | 5 | 14
Indefinite- lived intangible assets, Amortization |  | 0 | 0
Computer Software, Intangible Asset [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance |  | 467 | 416
Accumulated Amortization |  | (344) | (330)
Net Balance |  | 123 | 86
Contractual payment rights |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance |  | 57 | 65
Accumulated Amortization |  | (44) | (47)
Net Balance | [1] | 13 | 18
Emission allowances [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance |  | 15 | 0
Accumulated Amortization |  | 0 | 0
Net Balance | [2] | 15 | 0
Project Development Rights [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance |  | 93 | 57
Accumulated Amortization |  | (1) | (1)
Net Balance |  | 92 | 56
Contracts |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance |  | 137 | 92
Accumulated Amortization |  | (24) | (21)
Net Balance |  | 113 | 71
Other |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance |  | 78 | 98
Accumulated Amortization |  | (44) | (42)
Net Balance | [3] | $ 34 | $ 56
[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. During the fourth quarter of 2018, the Company recognized an asset impairment of $23 million on gas extraction rights at Nejapa. See Note 20—Asset Impairment Expense for further information.

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