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Financial instruments and risk management - Summary of financial instruments carried at fair value (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]    
Cash and cash equivalents $ 10,381 $ 8,027
Investments in equity shares and funds 3,764 3,971
Other investments, including loans 2,899 2,839
Trade and other financial receivables 3,286 2,938
Trade and other financial payables (5,847) (5,398)
Net assets 51,903 45,242
Provisionally priced receivables recognised relating to sales contracts 1,671 1,040
Fair value    
Disclosure of detailed information about financial instruments [line items]    
Cash and cash equivalents 10,381 8,027
Investments in equity shares and funds 75 61
Other investments, including loans 2,899 2,839
Trade and other financial receivables 3,286 2,938
Financial assets (excluding derivative assets)  
Forward contracts and option contracts: designated as hedges(f) (Section B) 53 42
Forward contracts and option contracts, not designated as hedges 180 120
Derivatives related to net debt 248 (147)
Trade and other financial payables (5,847) (5,398)
Net assets 11,275 8,482
Fair value | Level 1    
Disclosure of detailed information about financial instruments [line items]    
Cash and cash equivalents 6,411 5,320
Investments in equity shares and funds 35 26
Other investments, including loans 2,563 2,607
Trade and other financial receivables 5 15
Financial assets (excluding derivative assets)  
Forward contracts and option contracts: designated as hedges(f) (Section B) 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 9,014 7,968
Fair value | Level 2    
Disclosure of detailed information about financial instruments [line items]    
Investments in equity shares and funds 0 0
Other investments, including loans 0 0
Trade and other financial receivables 1,802 1,122
Financial assets (excluding derivative assets)  
Forward contracts and option contracts: designated as hedges(f) (Section B) 7 0
Forward contracts and option contracts, not designated as hedges 69 25
Derivatives related to net debt 248 (147)
Trade and other financial payables (30) (57)
Net assets 2,096 943
Fair value | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Investments in equity shares and funds 40 35
Other investments, including loans 198 211
Trade and other financial receivables 0 0
Financial assets (excluding derivative assets)  
Forward contracts and option contracts: designated as hedges(f) (Section B) 46 42
Forward contracts and option contracts, not designated as hedges 111 95
Derivatives related to net debt 0 0
Trade and other financial payables 0 0
Net assets 395 383
Not held at fair value    
Disclosure of detailed information about financial instruments [line items]    
Cash and cash equivalents 3,970 2,707
Investments in equity shares and funds 0 0
Other investments, including loans 138 21
Trade and other financial receivables 1,479 1,801
Financial assets (excluding derivative assets)  
Forward contracts and option contracts: designated as hedges(f) (Section B) 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 (5,817) (5,341)
Net assets $ (230) $ (812)