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Financial instruments - Summary of fair value of financial instruments (Detail) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents $ 11,412 $ 12,807 $ 14,027
Investments in equity shares and funds 3,392 3,504  
Net assets 57,098 56,590  
Level 1 | Fair value      
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents 3,916 4,138  
Investments in equity shares and funds 76 64  
Other investments, including loans 2,326 2,422  
Trade and other financial receivables 3 1  
Forward contracts and option contracts: designated as hedges 0 0  
Forward contracts and option contracts, not designated as hedges 0 0  
Derivatives related to net debt 0 0  
Trade and other financial payables 0 0  
Net assets 6,321 6,625  
Level 2 | Fair value      
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents 0 0  
Investments in equity shares and funds 0 0  
Other investments, including loans 0 0  
Trade and other financial receivables 1,365 1,163  
Forward contracts and option contracts: designated as hedges 0 0  
Forward contracts and option contracts, not designated as hedges 32 (131)  
Derivatives related to net debt (566) (101)  
Trade and other financial payables (80) (67)  
Net assets 751 864  
Level 3 | Fair value      
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents 0 0  
Investments in equity shares and funds 63 53  
Other investments, including loans 254 238  
Trade and other financial receivables 0 0  
Forward contracts and option contracts: designated as hedges (148) (125)  
Forward contracts and option contracts, not designated as hedges 17 11  
Derivatives related to net debt 0 0  
Trade and other financial payables 0 0  
Net assets $ 186 $ 177