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Financial instruments and risk management - Summary of capital and liquidity risk management (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Disclosure of detailed information about hedging instruments [Line Items] |  |  |  |
– attributable to Rio Tinto | $ 40,532 | $ 43,573 | $ 43,686 | $ 44,711
Equity attributable to non-controlling interests (see Group balance sheet) | 4,710 |  | 6,137 |
Net debt | 3,651 |  | (255) | $ 3,845
Capital And Liquidity Risk Management [Member] |  |  |  |
Disclosure of detailed information about hedging instruments [Line Items] |  |  |  |
– attributable to Rio Tinto | 40,532 |  | 43,686 |
Equity attributable to non-controlling interests (see Group balance sheet) | 4,710 |  | 6,137 |
Net debt | 3,651 |  | (255) |
Total capital | $ 48,893 |  | $ 49,568 |

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