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Income taxes (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Dec. 19, 2022
case
Apr. 28, 2022
USD ($)
May 31, 2021
USD ($)
notice
Income Tax Examination [Line Items]              
Income tax expense (benefit) $ 48 $ 235 $ 93 $ 836      
Income before income taxes $ 794 $ 1,614 $ 726 $ 5,056      
Effective income tax rate 6.00% 14.60% 12.80% 16.50%      
Increase in unrecognized tax benefits resulting from tax positions taken during the current period $ 40   $ 80        
Domestic Tax Authority              
Income Tax Examination [Line Items]              
Number of notices on proposed additional tax | notice             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