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Impairment charges - Narrative (Details) $ in Millions, t in Billions |  |  | 6 Months Ended
--- | --- | --- | ---
Jul. 09, 2020 | Jul. 16, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) t
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |  |
Impairment loss |  |  | $ 1,134 | $ 2,349
Impairment loss of equity accounted unit |  |  | 148 | 0
Property development and project management expense |  | $ 5,300 |  |
Minimums |  |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |  |
Increase in project expenses |  | 1,200 |  |
Maximums |  |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |  |
Increase in project expenses |  | $ 1,900 |  |
Investment in equity accounted units ('EAUs') |  |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |  |
Impairment loss |  |  | 119 | 0
Pacific Aluminum |  |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |  |
Contract termination notice period | 14 months |  |  |
Pacific Aluminum | Aluminium, Alumina and Bauxite |  |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |  |
Recoverable amount of asset or cash-generating unit |  |  | $ 273 |
Discount rate applied to cash flow projections |  |  | 6.60% |
Impairment loss |  |  | $ 489 | 0
Impairment loss |  |  | 26 |
Pacific Aluminum | Aluminium, Alumina and Bauxite | Pre-tax |  |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |  |
Impairment loss |  |  | 36 |
ISAL | Aluminium, Alumina and Bauxite |  |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |  |
Impairment loss |  |  | 204 | 109
Diavik | Copper & Diamonds |  |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |  |
Impairment loss |  |  | $ 441 | $ 0
Proportion of ownership interest in joint venture (as a percent) |  |  | 40.00% |
Aluchemie Anode Plant |  |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |  |
Percentage of ownership interest |  |  |  | 53.30%
Oyo Tolgoi Copper-Gold Mine |  |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |  |
Recoverable amount of asset or cash-generating unit |  |  |  | $ 8,300
Discount rate applied to cash flow projections |  |  |  | 8.30%
Mineral resources | t |  |  |  | 2
Recoverable amount, percent |  |  |  | 20.00%
Tax Impact of impairment |  |  |  | $ 320
Tax losses expected to expire |  |  |  | $ 359
NCI share of Impairment |  |  |  | 66.00%
Rio share of impairment |  |  |  | 34.00%
Rio share of impairment, value |  |  |  | $ 800
Oyo Tolgoi Copper-Gold Mine | Minimums |  |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |  |
Production delay period |  | 16 months |  |
Oyo Tolgoi Copper-Gold Mine | Maximums |  |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |  |
Production delay period |  | 30 months |  |
Oyo Tolgoi Copper-Gold Mine | Pre-tax |  |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |  |
Impairment loss |  |  |  | 2,200
Oyo Tolgoi Copper-Gold Mine | After Tax |  |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |  |
Impairment loss |  |  |  | $ 2,300

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