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Financial assets and liabilities - Changes in Level 3 assets and liabilities - (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2021
USD ($)
Disclosure of detailed information about borrowings [line items]  
Financial assets at beginning of period $ 92,007
Financial assets at end of period 96,716
Financial liabilities at beginning of period 57,186
Financial liabilities at end of period 54,357
Level 3  
Disclosure of detailed information about borrowings [line items]  
Financial assets at beginning of period 18
Gain and losses recognized in income statement (4)
Translation adjustments 1
Financial assets at end of period 15
Financial liabilities at beginning of period 19
Gain and losses recognized in income statement (13)
Financial liabilities at end of period $ 6