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Income taxes (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
Sep. 30, 2023
USD ($)
Sep. 30, 2022
Dec. 19, 2022
Case
Apr. 28, 2022
USD ($)
May 31, 2021
USD ($)
numberOfNotices
Income Tax Examination [Line Items]              
Effective income tax rate 11.10% 10.40% 15.00% 11.80%      
Increase in unrecognized tax benefits resulting from tax positions taken during the current period $ 50   $ 160        
Domestic Tax Authority              
Income Tax Examination [Line Items]              
Number of notices on proposed additional tax | numberOfNotices             2
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