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Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2024
Intangible Assets |
Schedule of Intangible Assets Subject to Amortization, net | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, 2024 |  | December 31, 2023 |
​ | ​ | Gross | ​ | ​ | ​ | Net | ​ | Gross | ​ | ​ | ​ | Net | ​
​ | ​ | carrying | ​ | Accumulated | ​ | carrying | ​ | carrying | ​ | Accumulated | ​ | carrying |
​ |  | amount |  | amortization |  | amount |  | amount |  | amortization |  | amount |
​ | ​ | amounts in millions |
Customer relationships | ​ | $ | 515 | ​ | (142) | ​ | 373 | ​ | 515 | ​ | (132) | ​ | 383 | ​
Other amortizable intangible assets | ​ |  | 159 | ​ | (83) | ​ | 76 | ​ | 156 | ​ | (78) | ​ | 78 | ​
Total | ​ | $ | 674 | ​ | (225) | ​ | 449 | ​ | 671 | ​ | (210) | ​ | 461 | ​
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | Amortization expense for amortizable intangible assets for each of the five succeeding fiscal years is estimated to be (amounts in millions): ​
​ | ​ | ​ | ​ | ​
Remainder of 2024 | ​ | $ | 44 | ​
2025 | ​ | $ | 54 | ​
2026 | ​ | $ | 51 | ​
2027 | ​ | $ | 49 | ​
2028 | ​ | $ | 47 | ​
​

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