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Goodwill and Other Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance |  | $ 728 | $ 612
Accumulated Amortization |  | (441) | (399)
Net Balance |  | 287 | 213
Indefinite-Lived Intangible Assets (Excluding Goodwill) |  | 79 | 74
Indefinite- lived intangible assets, Amortization |  | 0 | 0
Intangible Assets, Gross |  | 807 | 686
Intangible Assets, Net |  | 366 | 287
Land Use Rights [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) |  | 45 | 47
Indefinite- lived intangible assets, Amortization |  | 0 | 0
Water rights |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) |  | 20 | 17
Indefinite- lived intangible assets, Amortization |  | 0 | 0
Other |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) |  | 14 | 10
Indefinite- lived intangible assets, Amortization |  | 0 | 0
Computer Software, Intangible Asset [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance |  | 416 | 396
Accumulated Amortization |  | (330) | (304)
Net Balance |  | 86 | 92
Contractual payment rights |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance | [1] | 65 | 56
Accumulated Amortization | [1] | (47) | (42)
Net Balance | [1] | 18 | 14
Project Development Rights [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance |  | 57 | 4
Accumulated Amortization |  | (1) | (1)
Net Balance |  | 56 | 3
Contracts |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance |  | 92 | 53
Accumulated Amortization |  | (21) | (15)
Net Balance |  | 71 | 38
Other |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance | [2] | 98 | 103
Accumulated Amortization | [2] | (42) | (37)
Net Balance | [2] | $ 56 | $ 66
[1] | Represent legal rights to receive system reliability payments from the regulator.
[2] | Includes management rights, sales concessions, gas extraction rights, and other individually insignificant intangible assets.

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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