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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 Changes in goodwill for the years ended December 31, 2020, 2019 and 2018 are as follows:
(in millions) | Amount
Balance at December 31, 2018 | $ | 289 |
Additions | — |
Balance at December 31, 2019 | $ | 289 |
Additions (1) | 5 |
Balance at December 31, 2020 | $ | 294 |
(1) Refer to Note 17 for more details. The following summarizes goodwill and other intangible assets:
|  | December 31, 2020 | December 31, 2019
(in millions) | Weighted Average Amortization Period | Gross Carrying Amount | Accumulated Amortization | Net Carrying Amount | Gross Carrying Amount | Accumulated Amortization | Net Carrying Amount
Goodwill |  | $ | 294 |  | $ | — |  | $ | 294 |  | $ | 289 |  | $ | — |  | $ | 289 |
Amortizable intangibles: |  |  |  |  |  |  |
Customer contact lists | 10 years | 98 |  | (80) |  | 18 |  | 90 |  | (76) |  | 14 |
Developed technology | 5 years | — |  | — |  | — |  | 5 |  | (4) |  | 1 |
Total |  | $ | 98 |  | $ | (80) |  | $ | 18 |  | $ | 95 |  | $ | (80) |  | $ | 15 |
Amortization of intangible assets during the years ended December 31, 2020, 2019 and 2018 was $5 million for each period. We evaluate the remaining useful life of intangible assets quarterly to determine whether events and circumstances warrant a revision to the estimated remaining useful life. Expense related to intangibles amortization in future periods as of December 31, 2020 is expected to be as follows:
Year ending December 31: | Amount (in millions)
2021 | $ | 5 |
2022 | 5 |
2023 | 3 |
2024 | 1 |
2025 | 1 |
2026 and thereafter | 3 |
Total | $ | 18 |

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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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