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Financial assets and liabilities - Contracted undiscounted cash flows (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Not later than one year    
Financial assets and liabilities    
Borrowings $ 578 $ 585
Derivative financial instruments 2 8
Trade and other payables 1,991 1,632
Between one and two years    
Financial assets and liabilities    
Borrowings 578 585
Derivative financial instruments 84  
Between two and five years    
Financial assets and liabilities    
Borrowings 2,846 4,980
Derivative financial instruments 66  
Later than five years    
Financial assets and liabilities    
Borrowings 9,748 $ 7,484
Derivative financial instruments $ 151