Income taxes - Provision for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Tax Disclosure [Abstract]
Taxes calculated using the estimated annual effective tax rate	$ 170	$ 289	$ 346	$ 565
Discrete tax items	(50)	(9)	(38)	(47)
Provision for income taxes	$ 120	$ 280	$ 308	$ 518
Effective tax rate	10.00%	14.00%	12.00%	13.00%