Income taxes - Schedule of Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current provision:
Federal	$ 965	$ 1,524	$ 1,721
State	33	43	44
Foreign	759	786	304
Total current provision	1,757	2,353	2,069
Deferred benefit:
Federal	(860)	(1,124)	(1,185)
State	(18)	(25)	(27)
Foreign	(360)	(66)	(63)
Total deferred benefit	(1,238)	(1,215)	(1,275)
Total provision for income taxes	$ 519	$ 1,138	$ 794