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Financial instruments disclosures - Summary of financial instruments carried at fair value (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Disclosure Of Financial Instruments [Line Items]      
Cash and cash equivalents $ 5,989 $ 10,550 $ 7,746
Other investments, including loans 2,187    
Trade and other receivables [1] 2,713    
Fair value [member]      
Disclosure Of Financial Instruments [Line Items]      
Cash and cash equivalents 5,989 10,550  
Investments in equity shares and funds 141 136  
Other investments, including loans 2,187 1,152  
Trade and other receivables 2,713 2,985  
Financial assets (excluding derivative assets) 11,030 14,823  
Forward contracts: designated as hedges (90)    
Forward contracts and option contracts, not designated as hedges 232 (87)  
Derivatives related to net debt (310) (177)  
Trade and other payables (5,175) (5,922)  
Financial assets and liabilities net 5,687 8,637  
Fair value [member] | Level 1 [member]      
Disclosure Of Financial Instruments [Line Items]      
Cash and cash equivalents 3,130    
Investments in equity shares and funds 19 88  
Other investments, including loans 2,090 1,037  
Trade and other receivables 7    
Financial assets (excluding derivative assets) 5,246 1,125  
Financial assets and liabilities net 5,246 1,125  
Fair value [member] | Level 2 [member]      
Disclosure Of Financial Instruments [Line Items]      
Investments in equity shares and funds 81    
Trade and other receivables 758 90  
Financial assets (excluding derivative assets) 839 90  
Forward contracts and option contracts, not designated as hedges 9 11  
Derivatives related to net debt (310) (177)  
Trade and other payables (20) (15)  
Financial assets and liabilities net 518 (91)  
Fair value [member] | Level 3 [member]      
Disclosure Of Financial Instruments [Line Items]      
Investments in equity shares and funds 41 3  
Other investments, including loans 82 88  
Financial assets (excluding derivative assets) 123 91  
Forward contracts: designated as hedges (90)    
Forward contracts and option contracts, not designated as hedges 223 (98)  
Financial assets and liabilities net 256 (7)  
Not held at fair value [member]      
Disclosure Of Financial Instruments [Line Items]      
Cash and cash equivalents 2,859 10,550  
Investments in equity shares and funds   45  
Other investments, including loans 15 27  
Trade and other receivables 1,948 2,895  
Financial assets (excluding derivative assets) 4,822 13,517  
Trade and other payables (5,155) (5,907)  
Financial assets and liabilities net $ (333) $ 7,610  
[1] Trade and other receivables exclude non-financial assets such as pension surpluses, prepayment of tolling charges to joint operations and other prepayments within other receivables and will therefore differ to the amounts shown in the balance sheet.