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Financial instruments and risk management - Summary by currency, Group's net debt, after taking into account relevant cross currency interest rate swaps and foreign exchange contracts (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |  |
Total borrowings | $ (14,115) | $ (12,752) |
Cash and cash equivalents | 8,027 | 10,773 |
Other investments | 2,839 | 2,782 |
Net cash/(debt) | (3,651) | 255 | $ (3,845)
Foreign exchange risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total borrowings | (12,806) |  |
Lease liabilities | (1,309) |  |
Derivatives related to net debt: designated as hedges | (147) |  |
Cash and cash equivalents | 8,027 |  |
Other investments | 2,584 |  |
Net cash/(debt) | (3,651) | 255 |
Foreign exchange risk | US Dollars |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total borrowings | (12,233) |  |
Lease liabilities | (503) |  |
Derivatives related to net debt: designated as hedges | (147) |  |
Cash and cash equivalents | 7,456 |  |
Other investments | 2,584 |  |
Net cash/(debt) | (2,843) | 464 |
Foreign exchange risk | Australian dollar |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total borrowings | (382) |  |
Lease liabilities | (349) |  |
Cash and cash equivalents | 170 |  |
Net cash/(debt) | (561) | (255) |
Foreign exchange risk | Euro |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total borrowings | (4) |  |
Lease liabilities | (23) |  |
Cash and cash equivalents | 37 |  |
Net cash/(debt) | 10 | (22) |
Foreign exchange risk | South African rand |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Lease liabilities | (2) |  |
Cash and cash equivalents | 173 |  |
Net cash/(debt) | 171 | 95 |
Foreign exchange risk | Canadian dollar |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total borrowings | (185) |  |
Lease liabilities | (154) |  |
Cash and cash equivalents | 17 |  |
Net cash/(debt) | (322) | (134) |
Foreign exchange risk | Other currencies |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total borrowings | (2) |  |
Lease liabilities | (278) |  |
Cash and cash equivalents | 174 |  |
Net cash/(debt) | $ (106) | $ 107 |

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