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Financial instruments and risk management - Maturity analysis for non-derivative financial liabilities and derivative financial liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Maturity Analysis For Derivative Financial Liabilities [Line Items]    
Trade and other payables $ (5,922) $ (5,209)
Borrowings before swaps (15,297) (17,695)
Expected future interest payments (7,819) (8,627)
Other financial liabilities (345) (240)
Derivatives related to net debt - net settled 88 158
– gross inflows 2,663 2,424
– gross outflows (3,066) (3,100)
Derivatives not related to net debt - net settled (295) (2)
– gross inflows 795 29
– gross outflows (802) (29)
Total (30,000) (32,291)
Due within 1 year [member]    
Disclosure Of Maturity Analysis For Derivative Financial Liabilities [Line Items]    
Trade and other payables (5,488) (4,814)
Borrowings before swaps (552) (704)
Expected future interest payments (679) (783)
Other financial liabilities (302) (199)
Derivatives related to net debt - net settled 10 29
– gross inflows 62 55
– gross outflows (82) (73)
Derivatives not related to net debt - net settled (43) (2)
– gross inflows 795 29
– gross outflows (802) (29)
Total (7,081) (6,491)
Between 1 and 2 years [member]    
Disclosure Of Maturity Analysis For Derivative Financial Liabilities [Line Items]    
Trade and other payables (434) (395)
Borrowings before swaps (148) (191)
Expected future interest payments (673) (779)
Other financial liabilities (43) (41)
Derivatives related to net debt - net settled 10 29
– gross inflows 62 55
– gross outflows (82) (73)
Derivatives not related to net debt - net settled (36)  
Total (1,344) (1,395)
Between 2 and 3 years [member]    
Disclosure Of Maturity Analysis For Derivative Financial Liabilities [Line Items]    
Borrowings before swaps (1,011) (1,330)
Expected future interest payments (670) (722)
Derivatives related to net debt - net settled 14 27
– gross inflows 958 55
– gross outflows (1,051) (73)
Derivatives not related to net debt - net settled (33)  
Total (1,793) (2,043)
Between 3 and 4 years [member]    
Disclosure Of Maturity Analysis For Derivative Financial Liabilities [Line Items]    
Borrowings before swaps (916) (1,347)
Expected future interest payments (638) (667)
Derivatives related to net debt - net settled 11 25
– gross inflows 44 842
– gross outflows (55) (1,045)
Derivatives not related to net debt - net settled (24)  
Total (1,578) (2,192)
Between 4 and 5 years [member]    
Disclosure Of Maturity Analysis For Derivative Financial Liabilities [Line Items]    
Borrowings before swaps (1,283) (1,317)
Expected future interest payments (606) (620)
Derivatives related to net debt - net settled 7 23
– gross inflows 44 40
– gross outflows (55) (51)
Derivatives not related to net debt - net settled (21)  
Total (1,914) (1,925)
More than 5 years [member]    
Disclosure Of Maturity Analysis For Derivative Financial Liabilities [Line Items]    
Borrowings before swaps (11,387) (12,806)
Expected future interest payments (4,553) (5,056)
Derivatives related to net debt - net settled 36 25
– gross inflows 1,493 1,377
– gross outflows (1,741) (1,785)
Derivatives not related to net debt - net settled (138)  
Total $ (16,290) $ (18,245)