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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
GOODWILL AND OTHER INTANGIBLE ASSETS | GOODWILL AND OTHER INTANGIBLE ASSETS 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 |
Other 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 |
_____________________________
(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.
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 |  |  |  |  |  |  |
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 |
Intangible asset amortization expense was $47 million, $34 million and $37 million for the years ended December 31, 2018, 2017 and 2016, respectively.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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