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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2020
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, 2020 and 2019 (in millions):
| US and Utilities |  | South America |  | MCAC |  | Eurasia |  | Total
Balance as of December 31, 2019 |  |  |  |  |  |  |  |  |
Goodwill | $ | 2,786 |  |  | $ | 868 |  |  | $ | 16 |  |  | $ | — |  |  | $ | 3,670 |
Accumulated impairment losses | (2,611) |  |  | — |  |  | — |  |  | — |  |  | (2,611) |
Net balance | 175 |  |  | 868 |  |  | 16 |  |  | — |  |  | 1,059 |
Balance as of December 31, 2020 |  |  |  |  |  |  |  |  |
Goodwill | 2,788 |  |  | 868 |  |  | 16 |  |  | — |  |  | 3,672 |
Accumulated impairment losses | (2,611) |  |  | — |  |  | — |  |  | — |  |  | (2,611) |
Net balance | $ | 177 |  |  | $ | 868 |  |  | $ | 16 |  |  | $ | — |  |  | $ | 1,061 |
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, 2020 |  | December 31, 2019
| Gross Balance |  | Accumulated Amortization |  | Net Balance |  | Gross Balance |  | Accumulated Amortization |  | Net Balance
Subject to Amortization |  |  |  |  |  |  |  |  |  |  |
Internal-use software | $ | 386 |  |  | $ | (255) |  |  | $ | 131 |  |  | $ | 367 |  |  | $ | (228) |  |  | $ | 139 |
Contracts | 157 |  |  | (38) |  |  | 119 |  |  | 134 |  |  | (29) |  |  | 105 |
Project development rights (1) | 203 |  |  | (5) |  |  | 198 |  |  | 100 |  |  | (1) |  |  | 99 |
Emissions allowances (2) | 64 |  |  | — |  |  | 64 |  |  | 24 |  |  | — |  |  | 24 |
Concession rights | 201 |  |  | (18) |  |  | 183 |  |  | 39 |  |  | (35) |  |  | 4 |
Other (3) | 59 |  |  | (14) |  |  | 45 |  |  | 43 |  |  | (14) |  |  | 29 |
Subtotal | 1,070 |  |  | (330) |  |  | 740 |  |  | 707 |  |  | (307) |  |  | 400 |
Indefinite-Lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Land use rights | 39 |  |  | — |  |  | 39 |  |  | 21 |  |  | — |  |  | 21 |
Water rights | 20 |  |  | — |  |  | 20 |  |  | 20 |  |  | — |  |  | 20 |
Transmission rights | 22 |  |  | — |  |  | 22 |  |  | 23 |  |  | — |  |  | 23 |
Other | 6 |  |  | — |  |  | 6 |  |  | 5 |  |  | — |  |  | 5 |
Subtotal | 87 |  |  | — |  |  | 87 |  |  | 69 |  |  | — |  |  | 69 |
Total | $ | 1,157 |  |  | $ | (330) |  |  | $ | 827 |  |  | $ | 776 |  |  | $ | (307) |  |  | $ | 469 |
_____________________________ (1)Includes emission offset fee to the Air Quality Management District (AQMD) in order to transfer emission offsets from retired legacy Southland units to the new CCGT. (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, 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, 2020 | Amount |  | Subject to Amortization/Indefinite-Lived |  | Weighted Average Amortization Period (in years) |  | Amortization Method
Internal-use software | $ | 35 |  |  | Subject to Amortization |  | 4 |  | Straight-line
Contracts | 28 |  |  | Subject to Amortization |  | 20 |  | Straight-line
Project development rights | 109 |  |  | Subject to Amortization |  | 30 |  | Straight-line
Emissions allowances | 56 |  |  | Subject to Amortization |  | Various |  | As utilized
Transmission rights | 20 |  |  | Indefinite-Lived |  | N/A |  | N/A
Concession rights (1) | 184 |  |  | Subject to Amortization |  | 12 |  | Straight-line
Other | 22 |  |  | Various |  | N/A |  | N/A
Total | $ | 454 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
_____________________________ (1)Represents the fair value assigned to the extension of the Tietê hydroelectric plants' concession agreement with ANEEL, expected to be finalized in the first quarter of 2021. See Note 13—Contingencies for further information. The following table summarizes the estimated amortization expense by intangible asset category for 2021 through 2025:
(in millions) | 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025
Internal-use software | $ | 36 |  |  | $ | 30 |  |  | $ | 25 |  |  | $ | 23 |  |  | $ | 21 |
Contracts | 9 |  |  | 9 |  |  | 9 |  |  | 6 |  |  | 6 |
Concession rights | 16 |  |  | 16 |  |  | 17 |  |  | 16 |  |  | 16 |
Other | 9 |  |  | 9 |  |  | 8 |  |  | 8 |  |  | 7 |
Total | $ | 70 |  |  | $ | 64 |  |  | $ | 59 |  |  | $ | 53 |  |  | $ | 50 |
Intangible asset amortization expense was $54 million, $45 million and $47 million for the years ended December 31, 2020, 2019 and 2018, respectively.

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