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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, 2018
Dec. 31, 2017
Disclosure Of Maturity Analysis For Derivative Financial Liabilities [Line Items]    
Trade and other financial payables $ (5,552) $ (5,922)
Borrowings before swaps (12,917) (15,297)
Expected future interest payments (7,238) (7,819)
Other financial liabilities (666) (345)
Derivatives related to net debt - net settled (148) 88
– gross inflows 1,951 2,663
– gross outflows (2,429) (3,066)
Derivatives not related to net debt - net settled (83) (295)
– gross inflows 1,664 795
– gross outflows (1,733) (802)
Total (27,151) (30,000)
Due within 1 year [member]    
Disclosure Of Maturity Analysis For Derivative Financial Liabilities [Line Items]    
Trade and other financial payables (5,129) (5,488)
Borrowings before swaps (312) (552)
Expected future interest payments (651) (679)
Other financial liabilities (666) (302)
Derivatives related to net debt - net settled (36) 10
– gross inflows 48 62
– gross outflows (79) (82)
Derivatives not related to net debt - net settled (27) (43)
– gross inflows 1,664 795
– gross outflows (1,733) (802)
Total (6,921) (7,081)
Between 1 and 2 years [member]    
Disclosure Of Maturity Analysis For Derivative Financial Liabilities [Line Items]    
Trade and other financial payables (423) (434)
Borrowings before swaps (562) (148)
Expected future interest payments (653) (673)
Other financial liabilities   (43)
Derivatives related to net debt - net settled (36) 10
– gross inflows 508 62
– gross outflows (595) (82)
Derivatives not related to net debt - net settled (13) (36)
Total (1,774) (1,344)
Between 2 and 3 years [member]    
Disclosure Of Maturity Analysis For Derivative Financial Liabilities [Line Items]    
Borrowings before swaps (166) (1,011)
Expected future interest payments (636) (670)
Derivatives related to net debt - net settled (36) 14
– gross inflows 39 958
– gross outflows (58) (1,051)
Derivatives not related to net debt - net settled (5) (33)
Total (862) (1,793)
Between 3 and 4 years [member]    
Disclosure Of Maturity Analysis For Derivative Financial Liabilities [Line Items]    
Borrowings before swaps (660) (916)
Expected future interest payments (630) (638)
Derivatives related to net debt - net settled (36) 11
– gross inflows 39 44
– gross outflows (58) (55)
Derivatives not related to net debt - net settled (5) (24)
Total (1,350) (1,578)
Between 4 and 5 years [member]    
Disclosure Of Maturity Analysis For Derivative Financial Liabilities [Line Items]    
Borrowings before swaps (741) (1,283)
Expected future interest payments (586) (606)
Derivatives related to net debt - net settled 4 7
– gross inflows 39 44
– gross outflows (58) (55)
Derivatives not related to net debt - net settled (5) (21)
Total (1,347) (1,914)
More than 5 years [member]    
Disclosure Of Maturity Analysis For Derivative Financial Liabilities [Line Items]    
Borrowings before swaps (10,476) (11,387)
Expected future interest payments (4,082) (4,553)
Derivatives related to net debt - net settled (8) 36
– gross inflows 1,278 1,493
– gross outflows (1,581) (1,741)
Derivatives not related to net debt - net settled (28) (138)
Total $ (14,897) $ (16,290)