Income taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Apr. 28, 2022	May 31, 2021
Income Tax Examination [Line Items]
Effective income tax rate	14.00%	16.80%	12.90%	12.60%
Increase in unrecognized tax benefits resulting from tax positions taken during the current period	$ 50		$ 95
Domestic Tax Authority
Income Tax Examination [Line Items]
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