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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, 2019 | Dec. 31, 2018 | Jan. 01, 2019
Disclosure of financial liabilities [Abstract] |  |  |
Net debt at beginning balance | $ 255 | $ (3,845) |
Net debt, Adjustment for transition to new accounting standards |  |  | $ (1,248)
Foreign exchange adjustment | (65) | 213 |
Cash movements excluding exchange movements, net debt | (2,342) | 4,045 |
Other non-cash movements | (251) | (158) |
Net debt at ending balance | (3,651) | 255 |
Borrowings (including finance leases) Excluding Overdraft [member] |  |  |
Disclosure of financial liabilities [Abstract] |  |  |
Financial liabilities, beginning balance | (12,707) | (15,120) |
Financial liabilities, adjustment for transition to new accounting standards |  |  | 0
Foreign exchange adjustment | (5) | 123 |
Cash movements excluding exchange movements | 123 | 2,240 |
Other non-cash movements | (217) | 50 |
Financial liabilities, ending balance | (12,806) | (12,707) |
Lease liabilities [member] |  |  |
Disclosure of financial liabilities [Abstract] |  |  |
Financial liabilities, beginning balance | (44) | (53) |
Lease liabilities |  |  | (1,248)
Foreign exchange adjustment | (9) | 3 |
Cash movements excluding exchange movements | 315 | 6 |
Other non-cash movements | (323) | 0 |
Financial liabilities, ending balance | (1,309) | (44) |
Debt-related derivatives (included ino other financial assets/liabilities [member] |  |  |
Disclosure of financial liabilities [Abstract] |  |  |
Financial liabilities, beginning balance | (288) | (177) |
Financial liabilities, adjustment for transition to new accounting standards |  |  | 0
Foreign exchange adjustment | 3 | (64) |
Cash movements excluding exchange movements | 0 | 51 |
Other non-cash movements | 138 | (98) |
Financial liabilities, ending balance | (147) | (288) |
Overdraft or Cash [member] |  |  |
Disclosure of financial liabilities [Abstract] |  |  |
Cash and overdrafts, beginning balance | 10,772 | 10,547 |
Foreign exchange adjustment | (54) | 151 |
Cash movements excluding exchange movements | (2,808) | 191 |
Other non-cash movements | 117 | (117) |
Cash and overdrafts, ending balance | 8,027 | 10,772 |
Cash and Overdrafts, adjustment for transition to new accounting standards |  |  | 0
Other Investments [member] |  |  |
Disclosure of financial liabilities [Abstract] |  |  |
Cash and overdrafts, beginning balance | 2,522 | 958 |
Foreign exchange adjustment | 0 | 0 |
Cash movements excluding exchange movements | 28 | 1,557 |
Other non-cash movements | 34 | 7 |
Cash and overdrafts, ending balance | $ 2,584 | $ 2,522 |
Cash and Overdrafts, adjustment for transition to new accounting standards |  |  | $ 0

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