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Goodwill and other intangible assets (Tables) | 3 Months Ended
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Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Reconciliation of the change in goodwill | Reconciliations of the changes in the carrying value of goodwill for the first quarter of 2025 and for the year ended December 31, 2024 follow (in millions).
| March 31, 2025 |  |  | December 31, 2024 |
Balance at the beginning of the year* | $ | 83,880 |  |  | $ | 84,626 |
Business acquisitions |  | 58 |  |  |  | 87 |
Other, including foreign currency translation |  | 69 |  |  |  | (833 | )
Balance at the end of the period* | $ | 84,007 |  |  | $ | 83,880 |
—————— * Net of accumulated goodwill impairm ent s of $11.5 billion as of March 31, 2025 and December 31, 2024 and $11.1 billion as of December 31, 2023.
Schedule of intangible assets | Other intangible assets are summarized below (in millions).
| March 31, 2025 |  |  | December 31, 2024 |
| Gross carrying amount |  | Accumulated amortization |  | Net carrying value |  |  | Gross carrying amount |  | Accumulated amortization |  | Net carrying value |
Insurance and other: |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships | $ | 30,896 |  | $ | 8,990 |  | $ | 21,906 |  |  | $ | 30,941 |  | $ | 8,840 |  | $ | 22,101 |
Trademarks and trade names |  | 9,017 |  |  | 1,075 |  |  | 7,942 |  |  |  | 9,007 |  |  | 1,041 |  |  | 7,966 |
Patents and technology |  | 5,433 |  |  | 4,450 |  |  | 983 |  |  |  | 5,375 |  |  | 4,359 |  |  | 1,016 |
Other |  | 5,571 |  |  | 2,071 |  |  | 3,500 |  |  |  | 5,551 |  |  | 1,996 |  |  | 3,555 |
| $ | 50,917 |  | $ | 16,586 |  | $ | 34,331 |  |  | $ | 50,874 |  | $ | 16,236 |  | $ | 34,638 |
Railroad, utilities and energy: |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships and contracts | $ | 1,541 |  | $ | 738 |  | $ | 803 |  |  | $ | 1,553 |  | $ | 728 |  | $ | 825 |
Other |  | 436 |  |  | 129 |  |  | 307 |  |  |  | 437 |  |  | 126 |  |  | 311 |
| $ | 1,977 |  | $ | 867 |  | $ | 1,110 |  |  | $ | 1,990 |  | $ | 854 |  | $ | 1,136 |

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