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Basis of Preparation - Summary of Financial assets classification and measurement (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Disclosure Of Financial Assets [Line Items]      
Cash and cash equivalents $ 5,989 $ 10,550 $ 7,746
Trade and other receivables [1] 2,713    
Investments in equity shares and funds 141    
Other investments, including loans 2,187    
Forward contracts designated as hedges 24    
Forward contracts and option contracts not designated as hedges 281    
Derivatives related to net debt 63    
Loans to equity accounted units including quasi equity loans 179    
Financial Assets 11,577    
Held at Fair Value through Profit or Loss ('FVPL')      
Disclosure Of Financial Assets [Line Items]      
Cash and cash equivalents 3,130    
Trade and other receivables [1] 765    
Investments in equity shares and funds 81    
Other investments, including loans 2,172    
Forward contracts designated as hedges 24    
Forward contracts and option contracts not designated as hedges 281    
Derivatives related to net debt 63    
Financial Assets 6,516    
Held at FVOCI (designated)      
Disclosure Of Financial Assets [Line Items]      
Investments in equity shares and funds 60    
Financial Assets 60    
Held at Amortised Cost      
Disclosure Of Financial Assets [Line Items]      
Cash and cash equivalents 2,859    
Trade and other receivables [1] 1,948    
Other investments, including loans 15    
Loans to equity accounted units including quasi equity loans 179    
Financial Assets $ 5,001    
[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.