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Financial assets and liabilities - Changes in Level 3 assets and liabilities - (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Disclosure of detailed information about borrowings [line items]  
Financial assets at beginning of period $ 91,713
Financial assets at end of period 92,007
Financial liabilities at beginning of period 52,720
Financial liabilities at end of period 57,186
Level 3  
Disclosure of detailed information about borrowings [line items]  
Financial assets at beginning of period 24
Translation adjustments (6)
Financial assets at end of period 18
Financial liabilities at beginning of period 120
Gain and losses recognized in income statement (79)
Settlements, fair value measurement, liabilities (22)
Financial liabilities at end of period $ 19