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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
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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)

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