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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2018 and 2017 (in millions):
| US and Utilities |  | South America |  | MCAC |  | Eurasia |  | Total
Balance as of December 31, 2017 |  |  |  |  |  |  |  |  |
Goodwill | $ | 2,786 |  |  | $ | 868 |  |  | $ | 16 |  |  | $ | 122 |  |  | $ | 3,792 |
Accumulated impairment losses | (2,611 | ) |  | — |  |  | — |  |  | (122 | ) |  | (2,733 | )
Net balance | 175 |  |  | 868 |  |  | 16 |  |  | — |  |  | 1,059 |
Balance as of December 31, 2018 |  |  |  |  |  |  |  |  |
Goodwill | 2,786 |  |  | 868 |  |  | 16 |  |  | 122 |  |  | 3,792 |
Accumulated impairment losses | (2,611 | ) |  | — |  |  | — |  |  | (122 | ) |  | (2,733 | )
Net balance | $ | 175 |  |  | $ | 868 |  |  | $ | 16 |  |  | $ | — |  |  | $ | 1,059 |
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, 2018 |  | December 31, 2017
| Gross Balance |  | Accumulated Amortization |  | Net Balance |  | Gross Balance |  | Accumulated Amortization |  | Net Balance
Subject to Amortization |  |  |  |  |  |  |  |  |  |  |  |
Internal-use software | $ | 467 |  |  | $ | (344 | ) |  | $ | 123 |  |  | $ | 416 |  |  | $ | (330 | ) |  | $ | 86 |
Contracts | 137 |  |  | (24 | ) |  | 113 |  |  | 92 |  |  | (21 | ) |  | 71 |
Project development rights | 93 |  |  | (1 | ) |  | 92 |  |  | 57 |  |  | (1 | ) |  | 56 |
Contractual payment rights (1) | 57 |  |  | (44 | ) |  | 13 |  |  | 65 |  |  | (47 | ) |  | 18 |
Emissions allowances (2) | 15 |  |  | — |  |  | 15 |  |  | — |  |  | — |  |  | — |
Other (3) | 78 |  |  | (44 | ) |  | 34 |  |  | 98 |  |  | (42 | ) |  | 56 |
Subtotal | 847 |  |  | (457 | ) |  | 390 |  |  | 728 |  |  | (441 | ) |  | 287 |
Indefinite-Lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Land use rights | 21 |  |  | — |  |  | 21 |  |  | 45 |  |  | — |  |  | 45 |
Water rights | 20 |  |  | — |  |  | 20 |  |  | 20 |  |  | — |  |  | 20 |
Other | 5 |  |  | — |  |  | 5 |  |  | 14 |  |  | — |  |  | 14 |
Subtotal | 46 |  |  | — |  |  | 46 |  |  | 79 |  |  | — |  |  | 79 |
Total | $ | 893 |  |  | $ | (457 | ) |  | $ | 436 |  |  | $ | 807 |  |  | $ | (441 | ) |  | $ | 366 |
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(1) | Represent legal rights to receive system reliability payments from the regulator.
(2) | Acquired or purchased emissions allowances are finite-lived intangible assets that are expensed when utilized and included in net income for the year.
(3) Includes management rights, sales concessions, renewable energy credits and incentives, and other individually insignificant intangible assets. During the fourth quarter of 2018, the Company recognized an asset impairment of $23 million on gas extraction rights at Nejapa. See Note 20—Asset Impairment Expense for further information.
Schedule of Acquired Intangible Assets By Major Class | The following tables summarize other intangible assets acquired during the periods indicated (in millions):
December 31, 2018 | Amount |  | Subject to Amortization/Indefinite-Lived |  | Weighted Average Amortization Period (in years) |  | Amortization Method
Internal-use software | $ | 67 |  |  | Subject to Amortization |  | 6 |  | Straight-line
Contracts | 50 |  |  | Subject to Amortization |  | 24 |  | Straight-line
Project development rights | 35 |  |  | Subject to Amortization |  | 23 |  | Straight-line
Emissions allowances | 16 |  |  | Subject to Amortization |  | Various |  | As utilized
Other | 11 |  |  | Various |  | N/A |  | N/A
Total | $ | 179 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Schedule of Expected Amortization Expense | The following table summarizes the estimated amortization expense by intangible asset category for 2019 through 2023:
(in millions) | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023
Internal-use software | $ | 33 |  |  | $ | 28 |  |  | $ | 19 |  |  | $ | 13 |  |  | $ | 7 |
Contracts | 4 |  |  | 4 |  |  | 4 |  |  | 4 |  |  | 4 |
Other | 8 |  |  | 8 |  |  | 6 |  |  | 6 |  |  | 6 |
Total | $ | 45 |  |  | $ | 40 |  |  | $ | 29 |  |  | $ | 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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