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Income taxes - Changes in deferred tax (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Notes and other explanatory information [abstract]    
Balance at beginning of period, Assets $ 10,770 $ 11,441
Balance at beginning of period, Liabilities 1,413 1,881
Balance at beginning of period, Deferred taxes, net 9,357 9,560
Effect in income statement, Assets (1,620) (1,524)
Effect in income statement, Liabilities (32) 44
Effect in income statement, Deferred taxes, net (1,588) (1,568)
Translation adjustment, Assets 784 651
Translation adjustment, Liabilities 32 (1)
Translation adjustment, Deferred taxes, net 752 652
Other comprehensive income, Assets (30) (25)
Other comprehensive income, Liabilities (2) 47
Other comprehensive income, Deferred taxes, net (28) (72)
Balance at Ending of period, Assets 9,904 10,360
Balance at Ending of period, Liabilities 1,411 1,759
Balance at Ending of period, Deferred taxes, net $ 8,493 8,601
Transfers between, assets   (183)
Transfers between, liabilities   (183)
Other, Liabilities   (29)
Other, Deferred taxes, net   $ 29