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Intangibles, net | 12 Months Ended
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Dec. 31, 2024
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Intangibles, net | 9. Intangibles, net Identified intangible assets with determinable lives consist primarily of customer relationships, trademarks, trade names and patents acquired in acquisitions, and are being amortized on a straight-line basis over the estimated useful lives. Intangible assets that are fully amortized are removed from the disclosures. See Note 21 “Acquisitions” for additional information. No impairment for intangible assets was recognized for the years ended December 31, 2024, 2023 and 2022. Identified intangible assets by major classification consist of the following (in millions):
|  |  |  |  | Accumulated |  |  | Net Book |
|  | Gross |  |  | Amortization |  |  | Value |
December 31, 2024: |  |  |  |  |  |  |  |  |
Trade names and patents |  | $ | 22 |  |  | $ | (2 | ) |  | $ | 20 |
Customer relationships |  |  | 52 |  |  |  | (8 | ) |  |  | 44 |
Other |  |  | 4 |  |  |  | (3 | ) |  |  | 1 |
Total identified intangibles |  | $ | 78 |  |  | $ | (13 | ) |  | $ | 65 |
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 |
Amortization expense was $7 million, $5 million and $2 million for the years ended December 31, 2024, 2023, and 2022, 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 |
2025 |  | $ | 8 |
2026 |  |  | 7 |
2027 |  |  | 7 |
2028 |  |  | 7 |
2029 |  |  | 7 |

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