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Income taxes (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2023
USD ($)
Mar. 31, 2022
Dec. 19, 2022
Case
Apr. 28, 2022
USD ($)
May 31, 2021
USD ($)
Income Tax Examination [Line Items]          
Effective income tax rate 17.50% 11.90%      
Increase in unrecognized tax benefits resulting from tax positions taken during the current period $ 60        
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  
Number Of Notices Consolidated | Case     2