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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, 2019
Dec. 31, 2018
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Trade and other financial payables $ (5,307) $ (5,552)
Undiscounted Committed Future Cash Flow of Leases (1,670)  
Borrowings before swaps (12,829) (12,917)
Expected future interest payments (6,374) (7,238)
Other financial liabilities (247) (666)
Derivatives related to net debt - net settled (39) (148)
– gross inflows 1,910 1,951
– gross outflows (2,323) (2,429)
Derivatives not related to net debt - net settled (60) (83)
– gross inflows 699 1,664
– gross outflows (703) (1,733)
Total (26,943) (27,151)
Within 1 year [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Trade and other financial payables (4,841) (5,129)
Undiscounted Committed Future Cash Flow of Leases (349)  
Borrowings before swaps (723) (312)
Expected future interest payments (607) (651)
Other financial liabilities (247) (666)
Derivatives related to net debt - net settled (16) (36)
– gross inflows 495 48
– gross outflows (588) (79)
Derivatives not related to net debt - net settled (31) (27)
– gross inflows 699 1,664
– gross outflows (703) (1,733)
Total (6,911) (6,921)
Between 1 and 2 years [Member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Trade and other financial payables (45) (423)
Undiscounted Committed Future Cash Flow of Leases (267)  
Borrowings before swaps (171) (562)
Expected future interest payments (594) (653)
Other financial liabilities   0
Derivatives related to net debt - net settled (16) (36)
– gross inflows 40 508
– gross outflows (53) (595)
Derivatives not related to net debt - net settled 0 (13)
Total (1,106) (1,774)
Between 2 and 3 years [Member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Trade and other financial payables (12)  
Undiscounted Committed Future Cash Flow of Leases (157)  
Borrowings before swaps (665) (166)
Expected future interest payments (590) (636)
Derivatives related to net debt - net settled (16) (36)
– gross inflows 40 39
– gross outflows (53) (58)
Derivatives not related to net debt - net settled 0 (5)
Total (1,453) (862)
Between 3 and 4 years [Member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Trade and other financial payables (14)  
Undiscounted Committed Future Cash Flow of Leases (133)  
Borrowings before swaps (741) (660)
Expected future interest payments (551) (630)
Derivatives related to net debt - net settled 9 (36)
– gross inflows 40 39
– gross outflows (53) (58)
Derivatives not related to net debt - net settled (2) (5)
Total (1,445) (1,350)
Between 4 and 5 years [Member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Trade and other financial payables (15)  
Undiscounted Committed Future Cash Flow of Leases (93)  
Borrowings before swaps (1,209) (741)
Expected future interest payments (514) (586)
Derivatives related to net debt - net settled (3) 4
– gross inflows 507 39
– gross outflows (599) (58)
Derivatives not related to net debt - net settled (4) (5)
Total (1,930) (1,347)
More than 5 years [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Trade and other financial payables (380)  
Undiscounted Committed Future Cash Flow of Leases (671)  
Borrowings before swaps (9,320) (10,476)
Expected future interest payments (3,518) (4,082)
Derivatives related to net debt - net settled 3 (8)
– gross inflows 788 1,278
– gross outflows (977) (1,581)
Derivatives not related to net debt - net settled (23) (28)
Total $ (14,098) $ (14,897)