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Impairment charges - Summary of impairment charges (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Impairment charges | $ (3,487) | $ (132) | $ (796)
Impairment charges, Tax | 323 | 25 | 141
Impairment charges, Non-controlling interests | 1,506 | 3 | 174
Impairment charge, net amount | (1,658) | (104) | (481)
Intangible assets [Member] |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Impairment charges | (1) | (2) | (357)
Property, plant and equipment [Member] |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Impairment charges | (3,486) | (130) | (435)
Other assets and liabilities [member] |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Impairment charges | 0 | 0 | (4)
Argyle Diamond Mine [member] |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Impairment charges |  | 0 |
Copper & Diamonds [Member] | Oyu Tolgoi Llc [Member] |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Impairment charges | (2,240) | 0 | 0
Impairment charges, Tax | (39) |  |
Impairment charges, Non-controlling interests | 1,506 |  |
Impairment charge, net amount | (773) |  |
Copper & Diamonds [Member] | Argyle Diamond Mine [member] |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Impairment charges | 0 |  | (172)
Impairment charges, Tax | 0 |  |
Impairment charges, Non-controlling interests | 0 |  |
Impairment charge, net amount | 0 |  |
Aluminium [Member] | Yarwun Alumina Refinery [Member] |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Impairment charges | (1,138) | 0 | 0
Impairment charges, Tax | 339 |  |
Impairment charges, Non-controlling interests | 0 |  |
Impairment charge, net amount | (799) |  |
Aluminium [Member] | ISAL Smelter [Member] |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Impairment charges | (109) | (123) | 0
Impairment charges, Tax | 23 |  |
Impairment charges, Non-controlling interests | 0 |  |
Impairment charge, net amount | (86) |  |
Energy & Minerals [Member] | Rossing [member] |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Impairment charges | 0 | (9) | (267)
Impairment charges, Tax | 0 |  |
Impairment charges, Non-controlling interests | 0 |  |
Impairment charge, net amount | 0 |  |
Energy & Minerals [Member] | Roughrider [member] |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Impairment charges | 0 | $ 0 | $ (357)
Impairment charges, Tax | 0 |  |
Impairment charges, Non-controlling interests | 0 |  |
Impairment charge, net amount | $ 0 |  |

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