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Employee benefits (Details 2) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Notes and other explanatory information [abstract]        
Salaries, accrued vacations and related charges $ (857) $ (780) $ (1,604) $ (1,458)
Variable compensation program - PPP [1] (131) (129) (271) (247)
Profit sharing [1] (32) (34) (67) (65)
Management fees and charges (3) (2) (5) (5)
Total $ (1,023) $ (945) $ (1,947) $ (1,775)
[1] It includes adjustments to provisions related to previous years.