Income taxes (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($)	Mar. 31, 2024	Dec. 19, 2022 case	Apr. 28, 2022 USD ($)	Jul. 31, 2021 USD ($) notice
Income Tax Examination [Line Items]
Effective income tax rate	12.30%	(66.20%)
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
Number of notices consolidated | case			2
Domestic Tax Authority | Tax Years 2010-2012
Income Tax Examination [Line Items]
Proposed additional income tax					$ 3,600
Repatriation tax on proposed additional tax					$ 900
Domestic Tax Authority | Tax Year 2013-2015
Income Tax Examination [Line Items]
Proposed additional income tax				$ 5,100
Repatriation tax on proposed additional tax				2,200
Penalties on proposed additional income tax				$ 2,000