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Consolidated net debt - Analysis of changes in consolidated net debt (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Disclosure Of Financial Liabilities [Line Items]    
Net debt at beginning balance $ (3,845) $ (9,587)
Foreign exchange adjustment 20 (70)
Cash movements excluding exchange movements (1,361) 5,859
Other non-cash movements (43) (47)
Net debt at ending balance (5,229) (3,845)
Borrowings (including finance leases) Excluding Overdraft [Member]    
Disclosure Of Financial Liabilities [Line Items]    
Financial liabilities, beginning balance (15,173)  
Foreign exchange adjustment 73  
Cash movements excluding exchange movements 2,074  
Other non-cash movements 113  
Financial liabilities, ending balance (12,913) (15,173)
Debt-related derivatives (included in "Other financial assets/liabilities) [member]    
Disclosure Of Financial Liabilities [Line Items]    
Financial liabilities, beginning balance (177)  
Foreign exchange adjustment (33)  
Cash movements excluding exchange movements 51  
Other non-cash movements (151)  
Financial liabilities, ending balance (310) (177)
Other Investments [Member]    
Disclosure Of Financial Liabilities [Line Items]    
Cash and Overdrafts, Beginning balance 10,547  
Foreign exchange adjustment (20)  
Cash movements excluding exchange movements (4,533)  
Other non-cash movements (5)  
Cash and Overdrafts, ending balance 5,989 10,547
Other Investments [Member]    
Disclosure Of Financial Liabilities [Line Items]    
Other assets, Beginning balance 958  
Cash movements excluding exchange movements 1,047  
Other assets, ending balance $ 2,005 $ 958