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Principal associates - Summary information for joint ventures and associates that are not individually material to the group (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of associates [Line Items] |  |  |  |  |
(Loss)/profit after tax | $ 6,972 |  | $ 13,925 |  | $ 8,851
Other comprehensive loss | 346 |  | (3,139) |  | 3,088
Total comprehensive income/(loss) | 7,318 | [1] | 10,786 | [1] | $ 11,939
Associates |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |
Carrying value of Group's interest | 704 |  | 679 |  |
(Loss)/profit after tax | 3 |  | 9 |  |
Other comprehensive loss | 10 |  | (23) |  |
Total comprehensive income/(loss) | 13 |  | (14) |  |
Joint ventures [Member] |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |
Carrying value of Group's interest | 0 |  | 0 |  |
(Loss)/profit after tax | 0 |  | 0 |  |
Other comprehensive loss | 0 |  | 0 |  |
Total comprehensive income/(loss) | $ 0 |  | $ 0 |  |
[1] | Refer to Group statement of comprehensive income for further details. Adjustments to other reserves include currency translation attributable to owners of Rio Tinto, other than that arising on Rio Tinto Limited’s share capital.

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