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Goodwill and Other Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance |  | $ 804 | $ 753
Accumulated Amortization |  | (519) | (481)
Net Balance |  | 285 | 272
Indefinite-Lived Intangible Assets (Excluding Goodwill) |  | 74 | 68
Indefinite- lived intangible assets, Amortization |  | 0 | 0
Intangible Assets, Gross |  | 878 | 821
Intangible Assets, Net |  | 359 | 340
Land Use Rights [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) |  | 47 | 38
Indefinite- lived intangible assets, Amortization |  | 0 | 0
Water rights |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) |  | 17 | 17
Indefinite- lived intangible assets, Amortization |  | 0 | 0
Other |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) |  | 10 | 13
Indefinite- lived intangible assets, Amortization |  | 0 | 0
Computer Software, Intangible Asset [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance |  | 567 | 521
Accumulated Amortization |  | (424) | (388)
Net Balance |  | 143 | 133
Sales concessions |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance |  | 63 | 63
Accumulated Amortization |  | (22) | (15)
Net Balance |  | 41 | 48
Contractual payment rights |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance | [1] | 56 | 66
Accumulated Amortization | [1] | (42) | (46)
Net Balance | [1] | 14 | 20
Management rights |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance |  | 28 | 24
Accumulated Amortization |  | (13) | (10)
Net Balance |  | 15 | 14
Land Use Rights [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance |  | 25 | 25
Accumulated Amortization |  | (1) | 0
Net Balance |  | 24 | 25
Contracts |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance |  | 53 | 29
Accumulated Amortization |  | (15) | (12)
Net Balance |  | 38 | 17
All other |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance | [2] | 12 | 25
Accumulated Amortization | [2] | (2) | (10)
Net Balance | [2] | $ 10 | $ 15
[1] | (1) Represent legal rights to receive system reliability payments from the regulator.
[2] | Includes renewable energy credits, organization costs, project development 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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