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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2016
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, 2016 and 2015 in millions:
| US |  | Andes |  | MCAC |  | Europe |  | Asia |  | Total
Balance as of December 31, 2014 |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ | 2,658 |  |  | $ | 899 |  |  | $ | 149 |  |  | $ | 122 |  |  | $ | 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 |
Balance as of December 31, 2016 |  |  |  |  |  |  |  |  |  |  |
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 |
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, 2016 |  | December 31, 2015
| Gross Balance |  | Accumulated Amortization |  | Net Balance |  | Gross Balance |  | Accumulated Amortization |  | Net Balance
Subject to Amortization |  |  |  |  |  |  |  |  |  |  |  |
Internal-use software | $ | 567 |  |  | $ | (424 | ) |  | $ | 143 |  |  | $ | 521 |  |  | $ | (388 | ) |  | $ | 133 |
Sales concessions | 63 |  |  | (22 | ) |  | 41 |  |  | 63 |  |  | (15 | ) |  | 48 |
Contractual payment rights (1) | 56 |  |  | (42 | ) |  | 14 |  |  | 66 |  |  | (46 | ) |  | 20 |
Management rights | 28 |  |  | (13 | ) |  | 15 |  |  | 24 |  |  | (10 | ) |  | 14 |
Land use rights | 25 |  |  | (1 | ) |  | 24 |  |  | 25 |  |  | — |  |  | 25 |
Contracts | 53 |  |  | (15 | ) |  | 38 |  |  | 29 |  |  | (12 | ) |  | 17 |
Other (2) | 12 |  |  | (2 | ) |  | 10 |  |  | 25 |  |  | (10 | ) |  | 15 |
Subtotal | 804 |  |  | (519 | ) |  | 285 |  |  | 753 |  |  | (481 | ) |  | 272 |
Indefinite-Lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Land use rights | 47 |  |  | — |  |  | 47 |  |  | 38 |  |  | — |  |  | 38 |
Water rights | 17 |  |  | — |  |  | 17 |  |  | 17 |  |  | — |  |  | 17 |
Other | 10 |  |  | — |  |  | 10 |  |  | 13 |  |  | — |  |  | 13 |
Subtotal | 74 |  |  | — |  |  | 74 |  |  | 68 |  |  | — |  |  | 68 |
Total | $ | 878 |  |  | $ | (519 | ) |  | $ | 359 |  |  | $ | 821 |  |  | $ | (481 | ) |  | $ | 340 |
_____________________________
(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.
Schedule of Acquired Intangible Assets By Major Class | The following tables summarize other intangible assets acquired during the periods indicated (in millions):
December 31, 2016 | Amount |  | Subject to Amortization/Indefinite-Lived |  | Weighted Average Amortization Period (in years) |  | Amortization Method
Internal-use software | $ | 51 |  |  | Subject to Amortization |  | 4 |  | Straight-line
Contracts | 24 |  |  | Subject to Amortization |  | 26 |  | Straight-line
Other | 5 |  |  | Subject to Amortization |  | 13 |  | Straight-line
Total | $ | 80 |  |  |  |  |  |  |
December 31, 2015 | Amount |  | Subject to Amortization/ Indefinite-Lived |  | Weighted Average Amortization Period (in years) |  | Amortization Method
Internal-use software | $ | 29 |  |  | Subject to Amortization |  | 5 |  | Straight-line
Contracts | 22 |  |  | Subject to Amortization |  | 5 |  | Straight-line
Land-use rights (1) | 13 |  |  | Subject to Amortization |  | N/A |  | N/A
Other | 5 |  |  | Various |  | N/A |  | N/A
Total | $ | 69 |  |  |  |  |  |  |
_____________________________
(1) | The carrying value of these definite-lived intangible assets equals their salvage value
Schedule of Expected Amortization Expense | The following table summarizes the estimated amortization expense by intangible asset category for 2017 through 2021:
(in millions) | 2017 |  | 2018 |  | 2019 |  | 2020 |  | 2021
Internal-use software | 38 |  |  | 34 |  |  | 21 |  |  | 14 |  |  | 10 |
Sales concessions | 6 |  |  | 6 |  |  | 6 |  |  | 4 |  |  | 2 |
All other | 6 |  |  | 5 |  |  | 5 |  |  | 5 |  |  | 5 |
Total | $ | 50 |  |  | $ | 45 |  |  | $ | 32 |  |  | $ | 23 |  |  | $ | 17 |

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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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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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