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Income taxes - Changes in deferred tax (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Total        
Balance at beginning of period     $ 8,565 $ 7,335
Effect in income statement $ (872) $ 181 (1,167) 1,177
Translation adjustment     153 (2,225)
Other comprehensive income     (198) 1,886
Balance at end of period 7,353 8,173 7,353 8,173
Assets        
Balance at beginning of period     10,335 9,217
Effect in income statement     (1,130) 1,121
Translation adjustment     196 (2,352)
Other comprehensive income     (63) 1,818
Balance at end of period 9,338 9,804 9,338 9,804
Liabilities        
Balance at beginning of period     1,770 1,882
Effect in income statement     37 (56)
Translation adjustment     43 (127)
Other comprehensive income     135 (68)
Balance at end of period $ 1,985 $ 1,631 $ 1,985 $ 1,631