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Intangibles, net (Tables) | 12 Months Ended
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Dec. 31, 2021
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Identified Intangible Assets by Major Classification | As of December 31, 2021, identified intangible assets by major classification consist of the following (in millions):
|  |  |  |  | Accumulated |  |  | Net Book |
|  | Gross |  |  | Amortization |  |  | Value |
December 31, 2021: |  |  |  |  |  |  |  |  |
Customer relationships |  |  | 9 |  |  |  | (1 | ) |  |  | 8 |
Other |  |  | 1 |  |  |  | — |  |  |  | 1 |
Total identified intangibles |  | $ | 10 |  |  | $ | (1 | ) |  | $ | 9 |
Schedule of Estimated Amortization of Intangible Assets Excluding Assets Held-for-Sale | Amortization expense was $2 million, $4 million and $19 million for the years ended December 31, 2021, 2020, and 2019, respectively. The following table represents the total estimated amortization of intangible assets for the five succeeding years (in millions):
For the Year Ending December 31, |  | Estimated Amortization Expense |
2022 |  | $ | 1 |
2023 |  |  | 1 |
2024 |  |  | 1 |
2025 |  |  | 1 |
2026 |  |  | 1 |

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