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Investments in equity accounted units (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure Of Investments Accounted For Using Equity Method Explanatory [Abstract] |
Summary of investments in equity accounted units | Summary balance sheet (Rio Tinto share)
| 2019 US$m |  | 2018 US$m |
Rio Tinto's share of assets |  |
– Non-current assets | 5,820 |  | 6,000 |
– Current assets | 831 |  | 887 |
| 6,651 |  | 6,887 |
Rio Tinto's share of liabilities |  |
– Current liabilities | (675 | ) | (607 | )
– Non-current liabilities | (2,005 | ) | (1,981 | )
| (2,680 | ) | (2,588 | )
Rio Tinto's share of net assets | 3,971 |  | 4,299 |

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