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Financial instruments and risk management - Summary of financial assets by categories (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial assets [Line Items]    
Cash and cash equivalents $ 10,773 $ 10,550
Trade and other financial receivables 3,007 2,985
Equity shares and quoted funds 130 136
Other investments, including loans 2,782 1,152
IFRS 9 [member]    
Disclosure of financial assets [Line Items]    
Cash and cash equivalents 10,773  
Trade and other financial receivables 3,007  
Equity shares and quoted funds 130  
Other investments, including loans 2,782  
Derivatives related to net debt: designated as hedges 70  
Derivatives and embedded derivatives not related to net debt: not designated as hedges 432  
Embedded derivatives not related to net debt: designated as hedges 54  
Loans to equity accounted units including quasi equity loans 167  
Total financial assets 17,415  
IFRS 9 [member] | Amortised Cost [member]    
Disclosure of financial assets [Line Items]    
Cash and cash equivalents 2,779  
Trade and other financial receivables 2,015  
Other investments, including loans 6  
Loans to equity accounted units including quasi equity loans 167  
Total financial assets 4,967  
IFRS 9 [member] | Fair value through other comprehensive income [member]    
Disclosure of financial assets [Line Items]    
Equity shares and quoted funds 53  
Total financial assets 53  
IFRS 9 [member] | Fair value through profit and loss [member]    
Disclosure of financial assets [Line Items]    
Cash and cash equivalents 7,994  
Trade and other financial receivables 992  
Equity shares and quoted funds 77  
Other investments, including loans 2,776  
Derivatives related to net debt: designated as hedges 70  
Derivatives and embedded derivatives not related to net debt: not designated as hedges 432  
Embedded derivatives not related to net debt: designated as hedges 54  
Total financial assets $ 12,395  
IAS 39 [Member]    
Disclosure of financial assets [Line Items]    
Cash and cash equivalents   10,550
Trade and other financial receivables   2,985
Equity shares and quoted funds   136
Other investments, including loans   1,152
Derivatives related to net debt: designated as hedges   99
Derivatives and embedded derivatives not related to net debt: not designated as hedges   168
Loans to equity accounted units including quasi equity loans   198
Total financial assets   15,288
IAS 39 [Member] | Loans and receivables [member]    
Disclosure of financial assets [Line Items]    
Cash and cash equivalents   10,550
Trade and other financial receivables   2,895
Other investments, including loans   15
Loans to equity accounted units including quasi equity loans   198
Total financial assets   13,658
IAS 39 [Member] | Available for sale securities [member]    
Disclosure of financial assets [Line Items]    
Equity shares and quoted funds   136
Total financial assets   136
IAS 39 [Member] | Held at fair value [member]    
Disclosure of financial assets [Line Items]    
Trade and other financial receivables   90
Other investments, including loans   1,125
Derivatives related to net debt: designated as hedges   99
Derivatives and embedded derivatives not related to net debt: not designated as hedges   168
Total financial assets   1,482
IAS 39 [Member] | Held to maturity assets [member]    
Disclosure of financial assets [Line Items]    
Other investments, including loans   12
Total financial assets   $ 12