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Financial assets and liabilities - Changes in Level 3 assets and liabilities - (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Disclosure of detailed information about borrowings [line items]  
Financial assets at beginning of period $ 92,007
Financial assets at end of period 89,442
Financial liabilities at beginning of period 57,186
Financial liabilities at end of period 54,136
Level 3  
Disclosure of detailed information about borrowings [line items]  
Financial assets at beginning of period 18
Gain and losses recognized in income statement (7)
Translation adjustments 2
Financial assets at end of period 13
Financial liabilities at beginning of period 19
Gain and losses recognized in income statement (16)
Settlements, fair value measurement, liabilities $ (3)
Financial liabilities at end of period