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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of associates [Line Items] |  |  |  |
Profit after tax |  | $ 8,851 | $ 4,776 | $ (1,719)
Other comprehensive income |  | 3,088 | (63) | (2,030)
Total comprehensive income/(loss) for the year | [1] | 11,939 | 4,713 | $ (3,749)
Associates [Member] |  |  |  |
Disclosure of associates [Line Items] |  |  |  |
Carrying value of Group's interest |  | 571 | 707 |
Profit after tax |  | 25 | 36 |
Other comprehensive income |  | 14 | 13 |
Total comprehensive income/(loss) for the year |  | $ 39 | $ 49 |
[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 share capital.

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