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Goodwill and other intangible assets - Goodwill (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |
Balance at the beginning of the year | [1] | $ 83,880 | $ 84,626
Business acquisitions |  | 58 | 87
Other, including foreign currency translation |  | 69 | (833)
Balance at the end of the period | [1] | $ 84,007 | $ 83,880
[1] | 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.

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