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Intangible Assets | 3 Months Ended
--- | ---
Mar. 31, 2024
Intangible Assets |
Intangible Assets | (5) Intangible Assets 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 | ​
​ Amortization expense for intangible assets with finite useful lives was $15 million and $16 million for the three months ended March 31, 2024 and 2023, respectively. 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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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350-30/tableOfContent + Details
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