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Consolidated net cash/(debt) - Analysis of changes in consolidated net cash/(debt) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of financial liabilities [Abstract] |  |
Net debt at beginning balance | $ (3,845) | $ (9,587)
Foreign exchange adjustment | 213 | (70)
Cash movements excluding exchange movements, net debt | 4,045 | 5,859
Other non-cash movements | (158) | (47)
Net debt at ending balance | 255 | (3,845)
Borrowings (including finance leases) Excluding Overdraft [Member] |  |
Disclosure of financial liabilities [Abstract] |  |
Financial liabilities, beginning balance | (15,173) | (17,618)
Foreign exchange adjustment | 126 | (303)
Cash movements excluding exchange movements | 2,246 | 2,777
Other non-cash movements | 50 | (29)
Financial liabilities, ending balance | (12,751) | (15,173)
Debt-related derivatives (included in "Other financial assets/liabilities) [member] |  |
Disclosure of financial liabilities [Abstract] |  |
Financial liabilities, beginning balance | (177) | (408)
Foreign exchange adjustment | (64) | 245
Cash movements excluding exchange movements | 51 | 7
Other non-cash movements | (98) | (21)
Financial liabilities, ending balance | (288) | (177)
Other Investments [Member] |  |
Disclosure of financial liabilities [Abstract] |  |
Cash and Overdrafts, Beginning balance | 10,547 | 8,189
Foreign exchange adjustment | 151 | (12)
Cash movements excluding exchange movements | 191 | 2,370
Other non-cash movements | (117) |
Cash and Overdrafts, ending balance | 10,772 | 10,547
Other Investments [Member] |  |
Disclosure of financial liabilities [Abstract] |  |
Cash and Overdrafts, Beginning balance | 958 | 250
Cash movements excluding exchange movements | 1,557 | 705
Other non-cash movements | 7 | 3
Cash and Overdrafts, ending balance | $ 2,522 | $ 958

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