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Income taxes (Provision for Income Taxes) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Current provision:      
Federal $ 1,721 $ 865 $ 921
State 44 18 34
Foreign 304 359 277
Total current provision 2,069 1,242 1,232
Deferred benefit:      
Federal (1,185) (308) (321)
State (27) (9) 9
Foreign (63) (117) (51)
Total deferred benefit (1,275) (434) (363)
Total provision for income taxes $ 794 $ 808 $ 869