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Goodwill and other intangible assets (Tables) | 6 Months Ended
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Jun. 30, 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 six months of 2025 and for the year ended December 31, 2024 follow (in millions).
| June 30, 2025 |  |  | December 31, 2024 |
Balance at the beginning of the year* | $ | 83,880 |  |  | $ | 84,626 |
Business acquisitions |  | 61 |  |  |  | 87 |
Other, including foreign currency translation |  | 310 |  |  |  | (833 | )
Balance at the end of the period* | $ | 84,251 |  |  | $ | 83,880 |
—————— * Net of accumulated goodwill impairm ents o f $11.5 billion as of June 30, 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).
| June 30, 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 | $ | 30,939 |  | $ | 9,224 |  | $ | 21,715 |  |  | $ | 30,941 |  | $ | 8,840 |  | $ | 22,101 |
Trademarks and trade names |  | 9,031 |  |  | 1,111 |  |  | 7,920 |  |  |  | 9,007 |  |  | 1,041 |  |  | 7,966 |
Patents and technology |  | 5,572 |  |  | 4,579 |  |  | 993 |  |  |  | 5,375 |  |  | 4,359 |  |  | 1,016 |
Other |  | 5,607 |  |  | 2,156 |  |  | 3,451 |  |  |  | 5,551 |  |  | 1,996 |  |  | 3,555 |
| $ | 51,149 |  | $ | 17,070 |  | $ | 34,079 |  |  | $ | 50,874 |  | $ | 16,236 |  | $ | 34,638 |
Railroad, utilities and energy: |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships and contracts | $ | 1,540 |  | $ | 762 |  | $ | 778 |  |  | $ | 1,553 |  | $ | 728 |  | $ | 825 |
Other |  | 443 |  |  | 130 |  |  | 313 |  |  |  | 437 |  |  | 126 |  |  | 311 |
| $ | 1,983 |  | $ | 892 |  | $ | 1,091 |  |  | $ | 1,990 |  | $ | 854 |  | $ | 1,136 |

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