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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The following table summarizes the changes in the carrying amount of goodwill, by reportable segment for the years ended December 31, 2015 and 2014 in millions.
| US |  | Andes |  | MCAC |  | Europe |  | Asia |  | Total
Balance as of December 31, 2013 |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ | 2,658 |  |  | $ | 899 |  |  | $ | 149 |  |  | $ | 180 |  |  | $ | 68 |  |  | $ | 3,954 |
Accumulated impairment losses | (2,152 | ) |  | — |  |  | — |  |  | (180 | ) |  | — |  |  | (2,332 | )
Net balance | 506 |  |  | 899 |  |  | 149 |  |  | — |  |  | 68 |  |  | 1,622 |
Impairment losses | (164 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (164 | )
Balance as of December 31, 2014 |  |  |  |  |  |  |  |  |  |  |
Goodwill | 2,658 |  |  | 899 |  |  | 149 |  |  | 122 |  | (1) | 68 |  |  | 3,896 |
Accumulated impairment losses | (2,316 | ) |  | — |  |  | — |  |  | (122 | ) |  | — |  |  | (2,438 | )
Net balance | 342 |  |  | 899 |  |  | 149 |  |  | — |  |  | 68 |  |  | 1,458 |
Impairment losses | (317 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (317 | )
Goodwill acquired during the year | 16 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 16 |
Balance as of December 31, 2015 |  |  |  |  |  |  |  |  |  |  |
Goodwill | 2,674 |  |  | 899 |  |  | 149 |  |  | 122 |  |  | 68 |  |  | 3,912 |
Accumulated impairment losses | (2,633 | ) |  | — |  |  | — |  |  | (122 | ) |  | — |  |  | (2,755 | )
Net balance | $ | 41 |  |  | $ | 899 |  |  | $ | 149 |  |  | $ | — |  |  | $ | 68 |  |  | $ | 1,157 |
_____________________________ (1) Both the gross carrying amount and the accumulated impairment losses of the Europe segment have been reduced by $58 million with no impact on the net carrying amount for the segment. This relates to Ebute, which had fully impaired goodwill of $58 million and was sold in 2014.
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets | The following table summarizes the balances comprising other intangible assets in the accompanying Consolidated Balance Sheets (in millions) as of the periods indicated:
| December 31, 2015 |  | December 31, 2014
| Gross Balance |  | Accumulated Amortization |  | Net Balance |  | Gross Balance |  | Accumulated Amortization |  | Net Balance
Subject to Amortization |  |  |  |  |  |  |  |  |  |  |
Project development rights(1) | $ | 4 |  |  | $ | (1 | ) |  | $ | 3 |  |  | $ | 28 |  |  | $ | (1 | ) |  | $ | 27 |
Sales concessions | 71 |  |  | (19 | ) |  | 52 |  |  | 86 |  |  | (41 | ) |  | 45 |
Contractual payment rights(2) | 66 |  |  | (46 | ) |  | 20 |  |  | 69 |  |  | (40 | ) |  | 29 |
Management rights | 24 |  |  | (10 | ) |  | 14 |  |  | 33 |  |  | (13 | ) |  | 20 |
Land use rights | 28 |  |  | — |  |  | 28 |  |  | 25 |  |  | — |  |  | 25 |
Contracts | 29 |  |  | (12 | ) |  | 17 |  |  | 36 |  |  | (19 | ) |  | 17 |
Customer contracts and relationships (3) | 6 |  |  | (6 | ) |  | — |  |  | 63 |  |  | (39 | ) |  | 24 |
Other(4) | 15 |  |  | (3 | ) |  | 12 |  |  | 22 |  |  | (5 | ) |  | 17 |
Subtotal | 243 |  |  | (97 | ) |  | 146 |  |  | 362 |  |  | (158 | ) |  | 204 |
Indefinite-Lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Land use rights | 38 |  |  | — |  |  | 38 |  |  | 37 |  |  | — |  |  | 37 |
Water rights | 17 |  |  | — |  |  | 17 |  |  | 20 |  |  | — |  |  | 20 |
Other | 13 |  |  | — |  |  | 13 |  |  | 20 |  |  | — |  |  | 20 |
Subtotal | 68 |  |  | — |  |  | 68 |  |  | 77 |  |  | — |  |  | 77 |
Total | $ | 311 |  |  | $ | (97 | ) |  | $ | 214 |  |  | $ | 439 |  |  | $ | (158 | ) |  | $ | 281 |
_____________________________
(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) | Represent legal rights to receive system reliability payments from the regulator.
(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) | Includes renewable energy certificates, emission allowances and various other intangible assets none of which is individually significant.
Schedule of Acquired Intangible Assets By Major Class | The following tables summarize, by category, other intangible assets acquired during the period indicated ($ in millions):
| December 31, 2015
| Amount |  | Subject to Amortization/Indefinite-Lived |  | Weighted Average Amortization Period (in years) |  | Amortization Method
Contracts | $ | 22 |  |  | Subject to Amortization |  | 5 |  | Straight-line
Land-use rights | 13 |  |  | Subject to Amortization |  | N/A |  | N/A
Other | 5 |  |  | Various |  | N/A |  | N/A
Total | $ | 40 |  |  |  |  |  |  |
| December 31, 2014
| Amount |  | Subject to Amortization/ Indefinite-Lived |  | Weighted Average Amortization Period (in years) |  | Amortization Method
Renewable energy certificates | $ | 3 |  |  | Indefinite |  | N/A |  | N/A
Land-use rights | 16 |  |  | Subject to Amortization |  | N/A |  | N/A
Total | $ | 19 |  |  |  |  |  |  |
Schedule of Expected Amortization Expense | The following table summarizes the estimated amortization expense by intangible asset category for 2016 through 2020:
(in millions) | 2016 |  | 2017 |  | 2018 |  | 2019 |  | 2020
Sales concessions | 7 |  |  | 7 |  |  | 7 |  |  | 7 |  |  | 7 |
All other | 4 |  |  | 4 |  |  | 4 |  |  | 3 |  |  | 3 |
Total | $ | 11 |  |  | $ | 11 |  |  | $ | 11 |  |  | $ | 10 |  |  | $ | 10 |

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- Definition Disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References No definition available. + Details
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