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Goodwill and other intangible assets (Tables) | 3 Months Ended
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Mar. 31, 2024
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 three months of 2024 and for the year ended December 31, 2023 follow (in millions).
|  | March 31, 2024 |  |  | December 31, 2023 |
Balance at the beginning of the year |  | $ | 84,626 |  |  | $ | 78,119 |
Business acquisitions |  |  | 1 |  |  |  | 7,347 |
Other, including acquisition period remeasurements and foreign currency translation |  |  | (78 | ) |  |  | (840 | )
Balance at the end of the period* |  | $ | 84,549 |  |  | $ | 84,626 |
—————— * Net of accumulated goodwill impairm ents of $11.1 billion as of March 31, 2024 and Decem ber 31, 2023.
Schedule of intangible assets | Other intangible assets are summarized below (in millions).
|  | March 31, 2024 |  |  | December 31, 2023 |
|  | Gross carrying amount |  |  | Accumulated amortization |  |  | Net carrying value |  |  | Gross carrying amount |  |  | Accumulated amortization |  |  | Net carrying value |
Insurance and other: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 28,287 |  |  | $ | 8,051 |  |  | $ | 20,236 |  |  | $ | 28,305 |  |  | $ | 7,901 |  |  | $ | 20,404 |
Trademarks and trade names |  |  | 5,624 |  |  |  | 850 |  |  |  | 4,774 |  |  |  | 5,619 |  |  |  | 846 |  |  |  | 4,773 |
Patents and technology |  |  | 5,279 |  |  |  | 4,196 |  |  |  | 1,083 |  |  |  | 5,238 |  |  |  | 4,109 |  |  |  | 1,129 |
Other |  |  | 4,803 |  |  |  | 1,851 |  |  |  | 2,952 |  |  |  | 4,826 |  |  |  | 1,805 |  |  |  | 3,021 |
|  | $ | 43,993 |  |  | $ | 14,948 |  |  | $ | 29,045 |  |  | $ | 43,988 |  |  | $ | 14,661 |  |  | $ | 29,327 |
Railroad, utilities and energy: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships and contracts |  | $ | 4,092 |  |  | $ | 855 |  |  | $ | 3,237 |  |  | $ | 4,092 |  |  | $ | 791 |  |  | $ | 3,301 |
Trademarks and trade names |  |  | 3,592 |  |  |  | 126 |  |  |  | 3,466 |  |  |  | 3,592 |  |  |  | 98 |  |  |  | 3,494 |
Other |  |  | 1,182 |  |  |  | 181 |  |  |  | 1,001 |  |  |  | 1,174 |  |  |  | 156 |  |  |  | 1,018 |
|  | $ | 8,866 |  |  | $ | 1,162 |  |  | $ | 7,704 |  |  | $ | 8,858 |  |  | $ | 1,045 |  |  | $ | 7,813 |

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