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Income taxes (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024	Sep. 30, 2025 USD ($)	Sep. 30, 2024	Dec. 19, 2022 case	Apr. 30, 2022 USD ($)	Jul. 31, 2021 USD ($) notice
Income Tax Examination [Line Items]
Effective income tax rate	18.00%	8.70%	14.50%	9.50%
Increase in unrecognized tax benefits resulting from tax positions taken during the current period	$ 45		$ 145
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

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