Income taxes (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 19, 2022 case	Apr. 28, 2022 USD ($)	May 31, 2021 USD ($) notice
Income Tax Examination [Line Items]
Income tax expense (benefit)	$ 45	$ 601
(Loss) income before income taxes	$ (68)	$ 3,442
Effective income tax rate	(66.20%)	17.50%
Increase in unrecognized tax benefits resulting from tax positions taken during the current period	$ 40
Domestic Tax Authority
Income Tax Examination [Line Items]
Number of notices on proposed additional tax | notice					2
Proposed additional income tax					$ 3,600
Repatriation tax on proposed additional tax					$ 900
Proposed additional income tax 2013-2015				$ 5,100
Penalties on proposed additional income tax 2013-2015				2,000
Repatriation tax on proposed additional tax 2013-2015				$ 2,200
Number of notices consolidated | case			2