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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2019
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, 2019 and 2018 (in millions):
| US and Utilities |  | South America |  | MCAC |  | Eurasia |  | Total
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 |
Balance as of December 31, 2019 |  |  |  |  |  |  |  |  |
Goodwill | 2,786 |  |  | 868 |  |  | 16 |  |  | — |  | (1) | 3,670 |
Accumulated impairment losses | (2,611 | ) |  | — |  |  | — |  |  | — |  | (1) | (2,611 | )
Net balance | $ | 175 |  |  | $ | 868 |  |  | $ | 16 |  |  | $ | — |  |  | $ | 1,059 |
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(1) | Goodwill and accumulated impairment losses at the Eurasia reportable segment were reduced by $122 million due to the sale of Kilroot in 2019.
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, 2019 |  | December 31, 2018
| Gross Balance |  | Accumulated Amortization |  | Net Balance |  | Gross Balance |  | Accumulated Amortization |  | Net Balance
Subject to Amortization |  |  |  |  |  |  |  |  |  |  |  |
Internal-use software | $ | 367 |  |  | $ | (228 | ) |  | $ | 139 |  |  | $ | 467 |  |  | $ | (344 | ) |  | $ | 123 |
Contracts | 134 |  |  | (29 | ) |  | 105 |  |  | 137 |  |  | (24 | ) |  | 113 |
Project development rights | 100 |  |  | (1 | ) |  | 99 |  |  | 93 |  |  | (1 | ) |  | 92 |
Contractual payment rights (1) | — |  |  | — |  |  | — |  |  | 57 |  |  | (44 | ) |  | 13 |
Emissions allowances (2) | 24 |  |  | — |  |  | 24 |  |  | 15 |  |  | — |  |  | 15 |
Other (3) | 82 |  |  | (49 | ) |  | 33 |  |  | 78 |  |  | (44 | ) |  | 34 |
Subtotal | 707 |  |  | (307 | ) |  | 400 |  |  | 847 |  |  | (457 | ) |  | 390 |
Indefinite-Lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Land use rights | 21 |  |  | — |  |  | 21 |  |  | 21 |  |  | — |  |  | 21 |
Water rights | 20 |  |  | — |  |  | 20 |  |  | 20 |  |  | — |  |  | 20 |
Transmission rights | 23 |  |  | — |  |  | 23 |  |  | — |  |  | — |  |  | — |
Other | 5 |  |  | — |  |  | 5 |  |  | 5 |  |  | — |  |  | 5 |
Subtotal | 69 |  |  | — |  |  | 69 |  |  | 46 |  |  | — |  |  | 46 |
Total | $ | 776 |  |  | $ | (307 | ) |  | $ | 469 |  |  | $ | 893 |  |  | $ | (457 | ) |  | $ | 436 |
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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.
The following tables summarize other intangible assets acquired during the periods indicated (in millions):
December 31, 2019 | Amount |  | Subject to Amortization/Indefinite-Lived |  | Weighted Average Amortization Period (in years) |  | Amortization Method
Internal-use software | $ | 61 |  |  | Subject to Amortization |  | 5 |  | Straight-line
Contracts | 2 |  |  | Subject to Amortization |  | 35 |  | Straight-line
Project development rights | 8 |  |  | Subject to Amortization |  | 29 |  | Straight-line
Emissions allowances | 22 |  |  | Subject to Amortization |  | Various |  | As utilized
Transmission rights | 23 |  |  | Indefinite-Lived |  | N/A |  | N/A
Other | 5 |  |  | Various |  | N/A |  | N/A
Total | $ | 121 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
The following table summarizes the estimated amortization expense by intangible asset category for 2020 through 2024:
(in millions) | 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024
Internal-use software | $ | 34 |  |  | $ | 31 |  |  | $ | 22 |  |  | $ | 17 |  |  | $ | 15 |
Contracts | 4 |  |  | 4 |  |  | 4 |  |  | 4 |  |  | 4 |
Other | 6 |  |  | 5 |  |  | 5 |  |  | 5 |  |  | 5 |
Total | $ | 44 |  |  | $ | 40 |  |  | $ | 31 |  |  | $ | 26 |  |  | $ | 24 |
Intangible asset amortization expense was $45 million, $47 million and $34 million for the years ended December 31, 2019, 2018 and 2017, 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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