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Consolidated net debt - Analysis of changes in consolidated net debt (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial liabilities [Abstract]    
Net debt at beginning balance $ (9,587) $ (13,783)
Foreign exchange adjustment (70) 90
Cash movements excluding exchange movements, net debt 5,859 3,915
Other non-cash movements (47) 191
Net debt at ending balance (3,845) (9,587)
Borrowings (including finance leases) Excluding Overdraft [Member]    
Disclosure of financial liabilities [Abstract]    
Financial liabilities, beginning balance (17,618)  
Foreign exchange adjustment (303)  
Cash movements excluding exchange movements 2,777  
Other non-cash movements (29)  
Financial liabilities, ending balance (15,173) (17,618)
Debt-related derivatives (included in "Other financial assets/liabilities) [member]    
Disclosure of financial liabilities [Abstract]    
Financial liabilities, beginning balance (408)  
Foreign exchange adjustment 245  
Cash movements excluding exchange movements 7  
Other non-cash movements (21)  
Financial liabilities, ending balance (177) (408)
Cash/Overdraft [Member]    
Disclosure of financial liabilities [Abstract]    
Cash and Overdrafts, Beginning balance 8,189  
Foreign exchange adjustment (12)  
Cash movements excluding exchange movements 2,370  
Cash and Overdrafts, ending balance 10,547 8,189
Other Investments [ Member]    
Disclosure of financial liabilities [Abstract]    
Other assts, Beginning balance 250  
Cash movements excluding exchange movements 705  
Other non-cash movements 3  
Other assts, ending balance $ 958 $ 250