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Operating segments - Additional information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of operating segments [Line Items] |  |  |
Percentage of capital expenditure | 100.00% |  |
Percentage of depreciation and amortisation | 100.00% |  |
Share of profit after tax of equity accounted units | $ 301 | $ 513 | $ 339
Subsidiaries [Member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Share of sales revenue of equity accounted units | 32 | 41 | 22
Gross sales revenue [Member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Share of sales revenue of equity accounted units | 2,234 | 2,354 | 1,859
Underlying earnings [Member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Share of profit after tax of equity accounted units | 302 | 513 | 332
Underlying earnings [Member] | Copper & Diamonds [Member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Share of profit after tax of equity accounted units | 292 | 476 | 295
Underlying earnings [Member] | Other operations [Member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Share of profit after tax of equity accounted units | $ 10 | $ 37 | $ 37

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