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Financial instruments and risk management - Summary of financial assets and liabilities by categories (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial assets [Line Items]    
Cash and cash equivalents $ 10,381 $ 8,027
Trade and other financial receivables 3,286 2,938
Equity shares and quoted funds 75 61
Other investments, including loans 2,899 2,839
Loans to equity accounted units including quasi equity loans 153 152
Total 17,459 14,383
Trade And Other Financial Payables (5,847) (5,398)
Short-term borrowings and bank overdrafts (584) (1,022)
Medium-term and long-term borrowings (13,247) (13,093)
Derivatives and embedded derivatives not related to net debt: not designated as hedges (24)  
Embedded derivatives not related to net debt: designated as hedges (20) (24)
Other financial liabilities 0 (247)
Total financial liabilities (19,862) (20,111)
Highly liquid financial assets held in managed investment funds classified as held for trading 2,538 2,584
Amortised Cost    
Disclosure of financial assets [Line Items]    
Cash and cash equivalents 3,970 2,707
Trade and other financial receivables 1,479 1,801
Equity shares and quoted funds 0 0
Other investments, including loans 138 21
Loans to equity accounted units including quasi equity loans 153 152
Total 5,740 4,681
Fair value through other comprehensive income    
Disclosure of financial assets [Line Items]    
Cash and cash equivalents 0 0
Trade and other financial receivables 0 0
Equity shares and quoted funds 64 50
Other investments, including loans 0 0
Loans to equity accounted units including quasi equity loans 0 0
Total 64 50
Fair value through profit and loss    
Disclosure of financial assets [Line Items]    
Cash and cash equivalents 6,411 5,320
Trade and other financial receivables 1,807 1,137
Equity shares and quoted funds 11 11
Other investments, including loans 2,761 2,818
Loans to equity accounted units including quasi equity loans 0 0
Total 11,655 9,652
Fair value through profit loss    
Disclosure of financial assets [Line Items]    
Trade And Other Financial Payables (30) (57)
Short-term borrowings and bank overdrafts 0 0
Medium-term and long-term borrowings 0 0
Derivatives and embedded derivatives not related to net debt: not designated as hedges (24)  
Embedded derivatives not related to net debt: designated as hedges (20) (24)
Other financial liabilities 0 0
Total financial liabilities (214) (408)
Financial liabilities at amortised cost, category    
Disclosure of financial assets [Line Items]    
Trade And Other Financial Payables (5,817) (5,341)
Short-term borrowings and bank overdrafts (584) (1,022)
Medium-term and long-term borrowings (13,247) (13,093)
Derivatives and embedded derivatives not related to net debt: not designated as hedges 0  
Embedded derivatives not related to net debt: designated as hedges 0 0
Other financial liabilities 0 (247)
Total financial liabilities (19,648) (19,703)
Fair Value Hedges Related to Debt    
Disclosure of financial assets [Line Items]    
Derivatives related to net debt: designated as hedges 388 151
Embedded derivatives not related to net debt: designated as hedges 73 66
Derivatives related to net debt: designated as hedges (140) (298)
Fair Value Hedges Related to Debt | Amortised Cost    
Disclosure of financial assets [Line Items]    
Derivatives related to net debt: designated as hedges 0 0
Embedded derivatives not related to net debt: designated as hedges 0 0
Fair Value Hedges Related to Debt | Fair value through other comprehensive income    
Disclosure of financial assets [Line Items]    
Derivatives related to net debt: designated as hedges 0 0
Embedded derivatives not related to net debt: designated as hedges 0 0
Fair Value Hedges Related to Debt | Fair value through profit and loss    
Disclosure of financial assets [Line Items]    
Derivatives related to net debt: designated as hedges 388 151
Embedded derivatives not related to net debt: designated as hedges 73 66
Fair Value Hedges Related to Debt | Fair value through profit loss    
Disclosure of financial assets [Line Items]    
Derivatives related to net debt: designated as hedges (140) (298)
Fair Value Hedges Related to Debt | Financial liabilities at amortised cost, category    
Disclosure of financial assets [Line Items]    
Derivatives related to net debt: designated as hedges 0 0
Fair Value Hedges Excluding Net Debt    
Disclosure of financial assets [Line Items]    
Derivatives and embedded derivatives not related to net debt: not designated as hedges 204 149
Derivatives and embedded derivatives not related to net debt: not designated as hedges   (29)
Fair Value Hedges Excluding Net Debt | Amortised Cost    
Disclosure of financial assets [Line Items]    
Derivatives and embedded derivatives not related to net debt: not designated as hedges 0 0
Fair Value Hedges Excluding Net Debt | Fair value through other comprehensive income    
Disclosure of financial assets [Line Items]    
Derivatives and embedded derivatives not related to net debt: not designated as hedges 0 0
Fair Value Hedges Excluding Net Debt | Fair value through profit and loss    
Disclosure of financial assets [Line Items]    
Derivatives and embedded derivatives not related to net debt: not designated as hedges $ 204 149
Fair Value Hedges Excluding Net Debt | Fair value through profit loss    
Disclosure of financial assets [Line Items]    
Derivatives and embedded derivatives not related to net debt: not designated as hedges   (29)
Fair Value Hedges Excluding Net Debt | Financial liabilities at amortised cost, category    
Disclosure of financial assets [Line Items]    
Derivatives and embedded derivatives not related to net debt: not designated as hedges   $ 0