Income taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Apr. 28, 2022	May 31, 2021
Income Tax Examination [Line Items]
Effective income tax rate	11.90%	11.40%
Increase in unrecognized tax benefits resulting from tax positions taken during the current period	$ 45
Domestic Tax Authority
Income Tax Examination [Line Items]
Proposed additional income tax				$ 3,600
Repatriation tax on proposed additional tax				$ 900
Domestic Tax Authority | Subsequent Event [Member]
Income Tax Examination [Line Items]
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