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Goodwill and Other Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance |  | $ 243 | $ 362
Accumulated Amortization |  | (97) | (158)
Net Balance |  | 146 | 204
Indefinite-Lived Intangible Assets (Excluding Goodwill) |  | 68 | 77
Intangible Assets, Gross |  | 311 | 439
Intangible Assets, Net |  | 214 | 281
Land Use Rights [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) |  | 38 | 37
Water rights |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) |  | 17 | 20
Other |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) |  | 13 | 20
Project development rights |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance | [1] | 4 | 28
Accumulated Amortization | [1] | (1) | (1)
Net Balance | [1] | 3 | 27
Sales concessions |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance |  | 71 | 86
Accumulated Amortization |  | (19) | (41)
Net Balance |  | 52 | 45
Contractual payment rights |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance | [2] | 66 | 69
Accumulated Amortization | [2] | (46) | (40)
Net Balance | [2] | 20 | 29
Management rights |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance |  | 24 | 33
Accumulated Amortization |  | (10) | (13)
Net Balance |  | 14 | 20
Land Use Rights [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance |  | 28 | 25
Accumulated Amortization |  | 0 | 0
Net Balance |  | 28 | 25
Contracts |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance |  | 29 | 36
Accumulated Amortization |  | (12) | (19)
Net Balance |  | 17 | 17
Customer relationships & contracts |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance | [3] | 6 | 63
Accumulated Amortization | [3] | (6) | (39)
Net Balance | [3] | 0 | 24
All other |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Balance | [4] | 15 | 22
Accumulated Amortization | [4] | (3) | (5)
Net Balance | [4] | $ 12 | $ 17
[1] | (1) 2014 balance includes U.K. Wind operations. In August 2014 these assets were sold, but did not meet the criteria to be reported as discontinued operations and their results are reflected within continuing operations. See Note 24—Dispositions and Held-for-Sale Businesses for further information.
[2] | (2) Represent legal rights to receive system reliability payments from the regulator.
[3] | (3) 2014 balance includes DPLER which is considered held-for-sale as of December 31, 2015. See Note 24—Dispositions and Held-for-Sale Businesses for further information.
[4] | (4) Includes renewable energy certificates, emission allowances and various other intangible assets none of which is individually significant.

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