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Goodwill and other intangible assets - Goodwill (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]    
Balance at the beginning of the year $ 84,626 [1] $ 78,119
Business acquisitions 10 7,347
Other, including acquisition period remeasurements and foreign currency translation (225) (840)
Balance at the end of the period [1] $ 84,411 $ 84,626
[1] Net of accumulated goodwill impairments of $11.1 billion as of June 30, 2024 and December 31, 2023.