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Intangibles, net (Tables) | 12 Months Ended
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Dec. 31, 2023
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Identified Intangible Assets by Major Classification | Identified intangible assets by major classification consist of the following (in millions):
|  |  |  |  | Accumulated |  |  | Net Book |
|  | Gross |  |  | Amortization |  |  | Value |
December 31, 2023: |  |  |  |  |  |  |  |  |
Trade names and patents |  | $ | 2 |  |  | $ | (1 | ) |  | $ | 1 |
Customer relationships |  |  | 29 |  |  |  | (4 | ) |  |  | 25 |
Other |  |  | 4 |  |  |  | (2 | ) |  |  | 2 |
Total identified intangibles |  | $ | 35 |  |  | $ | (7 | ) |  | $ | 28 |
December 31, 2022: |  |  |  |  |  |  |  |  |
Trade names and patents |  | $ | 4 |  |  | $ | — |  |  | $ | 4 |
Customer relationships |  |  | 19 |  |  |  | (2 | ) |  |  | 17 |
Other |  |  | 4 |  |  |  | — |  |  |  | 4 |
Total identified intangibles |  | $ | 27 |  |  | $ | (2 | ) |  | $ | 25 |
Schedule of Estimated Amortization of Intangible Assets Excluding Assets Held-for-Sale | Amortization expense was $5 million, $2 million and $2 million for the years ended December 31, 2023, 2022, and 2021, 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 |
2024 |  | $ | 5 |
2025 |  |  | 4 |
2026 |  |  | 3 |
2027 |  |  | 3 |
2028 |  |  | 3 |

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