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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of associates [Line Items] |  |  |  |  |
Revenue | $ 43,165 |  | $ 40,522 |  | $ 40,030
(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
Non-current assets | 70,499 |  | 70,047 |  |
Current assets | 17,303 |  | 20,168 |  |
Non-current liabilities | (31,435) |  | (30,261) |  |
Net assets/(liabilities) | 45,242 |  | 49,823 |  |
Quasi equity loans to equity accounted units | 113 |  | 129 |  |
Boyne Smelters Limited |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |
Revenue | 0 |  | 0 |  |
(Loss)/profit after tax | (7) |  | (12) |  |
Other comprehensive loss | (3) |  | (68) |  |
Total comprehensive income/(loss) | (10) |  | (80) |  |
Non-current assets | 1,229 |  | 1,268 |  |
Current assets | 96 |  | 93 |  |
Current liabilities | (114) |  | (113) |  |
Non-current liabilities | (814) |  | (842) |  |
Net assets/(liabilities) | 397 |  | 406 |  |
Group's ownership interest | 236 |  | 241 |  |
Quasi equity loans to equity accounted units | 113 |  | 129 |  |
Carrying value of Group's interest | $ 349 |  | $ 370 |  |
[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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