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Financial instruments and risk management - Summary of financial instruments carried at fair value (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]    
Cash and cash equivalents $ 8,027 $ 10,773
Investments in equity shares and funds 3,971 4,299
Equity shares and quoted funds 61 130
Other investments, including loans 2,839 2,782
Trade and other financial receivables 2,938 3,007
Trade and other financial payables (5,398) (5,552)
Net assets 45,242 49,823
Fair value    
Disclosure of detailed information about financial instruments [line items]    
Cash and cash equivalents 8,027 10,773
Investments in equity shares and funds 61 130
Other investments, including loans 2,839 2,782
Trade and other financial receivables 2,938 3,007
Financial assets (excluding derivative assets)   16,692
Forward contracts and option contracts: designated as hedges(f) (Section B) 42 8
Forward contracts and option contracts, not designated as hedges 120 334
Derivatives related to net debt (147) (288)
Trade and other financial payables (5,398) (5,552)
Net assets 8,482 11,194
Fair value | Level 1 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Cash and cash equivalents 5,320 7,994
Investments in equity shares and funds 26 92
Other investments, including loans 2,607 2,544
Trade and other financial receivables 15 20
Financial assets (excluding derivative assets)   10,650
Net assets 7,968 10,650
Fair value | Level 2    
Disclosure of detailed information about financial instruments [line items]    
Trade and other financial receivables 1,122 972
Financial assets (excluding derivative assets)   972
Forward contracts and option contracts, not designated as hedges 25 (25)
Derivatives related to net debt (147) (288)
Trade and other financial payables (57) (39)
Net assets 943 620
Fair value | Level 3 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Investments in equity shares and funds 35 38
Other investments, including loans 211 232
Financial assets (excluding derivative assets)   270
Forward contracts and option contracts: designated as hedges(f) (Section B) 42 8
Forward contracts and option contracts, not designated as hedges 95 359
Net assets 383 637
Not held at fair value    
Disclosure of detailed information about financial instruments [line items]    
Cash and cash equivalents 2,707 2,779
Other investments, including loans 21 6
Trade and other financial receivables 1,801 2,015
Financial assets (excluding derivative assets)   4,800
Trade and other financial payables (5,341) (5,513)
Net assets $ (812) $ (713)