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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

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