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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The following table summarizes the carrying amount of goodwill by reportable segment for the years ended December 31, 2017 and 2016 (in millions):
| US |  | Andes |  | MCAC |  | Eurasia |  | Total
Balance as of December 31, 2016 |  |  |  |  |  |  |  |  |
Goodwill | $ | 2,674 |  |  | $ | 899 |  |  | $ | 149 |  |  | $ | 190 |  |  | $ | 3,912 |
Accumulated impairment losses | (2,633 | ) |  | — |  |  | — |  |  | (122 | ) |  | (2,755 | )
Net balance | 41 |  |  | 899 |  |  | 149 |  |  | 68 |  |  | 1,157 |
Transfer to assets held-for-sale (1) | — |  |  | (30 | ) |  | — |  |  | (68 | ) |  | (98 | )
Balance as of December 31, 2017 |  |  |  |  |  |  |  |  |
Goodwill | 2,674 |  |  | 869 |  |  | 149 |  |  | 122 |  |  | 3,814 |
Accumulated impairment losses | (2,633 | ) |  | — |  |  | — |  |  | (122 | ) |  | (2,755 | )
Net balance | $ | 41 |  |  | $ | 869 |  |  | $ | 149 |  |  | $ | — |  |  | $ | 1,059 |
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(1) | See Note 22---Held-For-Sale Businesses and Dispositions for further information.
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, 2017 |  | December 31, 2016
| Gross Balance |  | Accumulated Amortization |  | Net Balance |  | Gross Balance |  | Accumulated Amortization |  | Net Balance
Subject to Amortization |  |  |  |  |  |  |  |  |  |  |  |
Internal-use software | $ | 416 |  |  | $ | (330 | ) |  | $ | 86 |  |  | $ | 396 |  |  | $ | (304 | ) |  | $ | 92 |
Contracts | 92 |  |  | (21 | ) |  | 71 |  |  | 53 |  |  | (15 | ) |  | 38 |
Contractual payment rights (1) | 65 |  |  | (47 | ) |  | 18 |  |  | 56 |  |  | (42 | ) |  | 14 |
Project development rights | 57 |  |  | (1 | ) |  | 56 |  |  | 4 |  |  | (1 | ) |  | 3 |
Other (2) | 98 |  |  | (42 | ) |  | 56 |  |  | 103 |  |  | (37 | ) |  | 66 |
Subtotal | 728 |  |  | (441 | ) |  | 287 |  |  | 612 |  |  | (399 | ) |  | 213 |
Indefinite-Lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Land use rights | 45 |  |  | — |  |  | 45 |  |  | 47 |  |  | — |  |  | 47 |
Water rights | 20 |  |  | — |  |  | 20 |  |  | 17 |  |  | — |  |  | 17 |
Other | 14 |  |  | — |  |  | 14 |  |  | 10 |  |  | — |  |  | 10 |
Subtotal | 79 |  |  | — |  |  | 79 |  |  | 74 |  |  | — |  |  | 74 |
Total | $ | 807 |  |  | $ | (441 | ) |  | $ | 366 |  |  | $ | 686 |  |  | $ | (399 | ) |  | $ | 287 |
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(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.
Schedule of Acquired Intangible Assets By Major Class | The following tables summarize other intangible assets acquired during the periods indicated (in millions):
December 31, 2017 | Amount |  | Subject to Amortization/Indefinite-Lived |  | Weighted Average Amortization Period (in years) |  | Amortization Method
Project Development Rights | $ | 53 |  |  | Subject to Amortization |  | 30 |  | Straight-line
Contracts | 34 |  |  | Subject to Amortization |  | 25 |  | Straight-line
Internal-use software | 17 |  |  | Subject to Amortization |  | 7 |  | Straight-line
Other | 8 |  |  | Various |  | N/A |  | N/A
Total | $ | 112 |  |  |  |  |  |  |
December 31, 2016 | Amount |  | Subject to Amortization/Indefinite-Lived |  | Weighted Average Amortization Period (in years) |  | Amortization Method
Internal-use software | $ | 41 |  |  | Subject to Amortization |  | 4 |  | Straight-line
Contracts | 24 |  |  | Subject to Amortization |  | 26 |  | Straight-line
Other | 5 |  |  | Subject to Amortization |  | 13 |  | Straight-line
Total | $ | 70 |  |  |  |  |  |  |
Schedule of Expected Amortization Expense | The following table summarizes the estimated amortization expense by intangible asset category for 2018 through 2022:
(in millions) | 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022
Internal-use software | $ | 17 |  |  | $ | 14 |  |  | $ | 12 |  |  | $ | 10 |  |  | $ | 9 |
Contracts | 5 |  |  | 5 |  |  | 5 |  |  | 5 |  |  | 5 |
Other | 11 |  |  | 12 |  |  | 10 |  |  | 8 |  |  | 9 |
Total | $ | 33 |  |  | $ | 31 |  |  | $ | 27 |  |  | $ | 23 |  |  | $ | 23 |

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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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