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Principal associates - Reconciliation of financial information for principal associates by carrying value (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of associates [Line Items] |  |  |  |
Revenue |  | $ 40,522 | $ 40,030 | $ 33,781
(Loss)/profit after tax |  | 13,925 | 8,851 | 4,776
Other comprehensive (loss)/income |  | (3,139) | 3,088 | (63)
Total comprehensive income for the year | [1] | 10,786 | 11,939 | $ 4,713
– Non-current assets |  | 70,047 | 76,554 |
– Current assets |  | 20,168 | 18,678 |
– Non-current liabilities |  | (30,261) | (33,262) |
Net assets |  | 49,823 | 51,115 |
Net assets/(liabilities) |  | 49,823 | 51,115 |
Boyne Smelters Limited [member] |  |  |  |
Disclosure of associates [Line Items] |  |  |  |
(Loss)/profit after tax |  | (12) | 5 |
Other comprehensive (loss)/income |  | (68) | 56 |
Total comprehensive income for the year |  | (80) | 61 |
– Non-current assets |  | 1,268 | 1,468 |
– Current assets |  | 93 | 88 |
– Current liabilities |  | (113) | (99) |
– Non-current liabilities |  | (842) | (996) |
Net assets |  | $ 406 | $ 461 |
Group interest (%), Associate |  | 59.40% | 59.40% |
Net assets/(liabilities) |  | $ 406 | $ 461 |
Group's ownership interest |  | 241 | 274 |
Quasi equity loans to equity accounted units |  | 129 | 159 |
Carrying value of Group's interest |  | $ 370 | $ 433 |
[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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