Income taxes - Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current provision:
Federal	$ 1,524	$ 1,721	$ 865
State	43	44	18
Foreign	786	304	359
Total current provision	2,353	2,069	1,242
Deferred benefit:
Federal	(1,124)	(1,185)	(308)
State	(25)	(27)	(9)
Foreign	(66)	(63)	(117)
Total deferred benefit	(1,215)	(1,275)	(434)
Total provision for income taxes	$ 1,138	$ 794	$ 808