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Financial instruments and risk management - Summary of financial assets by categories (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial assets [Line Items]    
Cash and cash equivalents $ 8,027 $ 10,773
Trade and other financial receivables 2,938 3,007
Equity shares and quoted funds 61 130
Other investments, including loans 2,839 2,782
Loans to equity accounted units including quasi equity loans 152 167
Total financial assets 14,383 17,415
Trade And Other Financial Payables (5,398) (5,552)
Current borrowings (1,022) (312)
Non-current portion of non-current borrowings (13,093) (12,440)
Derivatives and embedded derivatives not related to net debt: not designated as hedges (29)  
Embedded derivatives not related to net debt: designated as hedges (24)  
Embedded derivatives not related to net debt: designated as hedges   (46)
Other financial liabilities (247) (666)
Financial liabilities (20,111) (19,472)
Highly liquid financial assets held in managed investment funds classified as held for trading 2,584 2,522
Amortised Cost    
Disclosure of financial assets [Line Items]    
Cash and cash equivalents 2,707  
Trade and other financial receivables 1,801  
Other investments, including loans 21  
Loans to equity accounted units including quasi equity loans 152 167
Total financial assets 4,681  
Fair value through other comprehensive income    
Disclosure of financial assets [Line Items]    
Trade and other financial receivables 0  
Equity shares and quoted funds 50  
Total financial assets 50  
Fair value through profit and loss    
Disclosure of financial assets [Line Items]    
Cash and cash equivalents 5,320 7,994
Trade and other financial receivables 1,137  
Equity shares and quoted funds 11 77
Other investments, including loans 2,818  
Total financial assets 9,652  
Loans and receivables    
Disclosure of financial assets [Line Items]    
Cash and cash equivalents   2,779
Trade and other financial receivables   2,015
Other investments, including loans   6
Total financial assets   4,967
Trade And Other Financial Payables   (5,513)
Current borrowings   (312)
Non-current portion of non-current borrowings   (12,440)
Embedded derivatives not related to net debt: designated as hedges   0
Other financial liabilities   (666)
Financial liabilities   (18,931)
Available for sale securities    
Disclosure of financial assets [Line Items]    
Equity shares and quoted funds   53
Total financial assets   53
Held at fair value    
Disclosure of financial assets [Line Items]    
Trade and other financial receivables   992
Other investments, including loans   2,776
Total financial assets   12,395
Financial liabilities at fair value through profit or loss, category    
Disclosure of financial assets [Line Items]    
Trade And Other Financial Payables   (39)
Embedded derivatives not related to net debt: designated as hedges   (46)
Financial liabilities   (541)
Fair value through profit loss    
Disclosure of financial assets [Line Items]    
Trade And Other Financial Payables (57)  
Derivatives and embedded derivatives not related to net debt: not designated as hedges (29)  
Embedded derivatives not related to net debt: designated as hedges (24)  
Financial liabilities (408)  
Financial liabilities at amortised cost, category    
Disclosure of financial assets [Line Items]    
Trade And Other Financial Payables (5,341)  
Current borrowings (1,022)  
Non-current portion of non-current borrowings (13,093)  
Other financial liabilities (247)  
Financial liabilities (19,703)  
Fair Value Hedges Related to Debt [Member]    
Disclosure of financial assets [Line Items]    
Derivatives related to net debt: designated as hedges 151 70
Embedded derivatives not related to net debt: designated as hedges 66 54
Derivatives related to net debt: designated as hedges (298) (358)
Fair Value Hedges Related to Debt [Member] | Fair value through profit and loss    
Disclosure of financial assets [Line Items]    
Derivatives related to net debt: designated as hedges 151 70
Embedded derivatives not related to net debt: designated as hedges 66 54
Fair Value Hedges Related to Debt [Member] | Fair value through profit loss    
Disclosure of financial assets [Line Items]    
Derivatives related to net debt: designated as hedges (298) (358)
Fair Value Hedges Excluding Net Debt [Member]    
Disclosure of financial assets [Line Items]    
Derivative financial assets held for trading   432
Derivatives and embedded derivatives not related to net debt: not designated as hedges 149  
Derivative financial liabilities held for trading   (98)
Fair Value Hedges Excluding Net Debt [Member] | Fair value through profit and loss    
Disclosure of financial assets [Line Items]    
Derivative financial assets held for trading   432
Derivatives and embedded derivatives not related to net debt: not designated as hedges $ 149  
Fair Value Hedges Excluding Net Debt [Member] | Fair value through profit loss    
Disclosure of financial assets [Line Items]    
Derivative financial liabilities held for trading   $ (98)