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Impairment charges - Summary of impairment charges (Detail) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Total impairment charge |  | $ 0 | $ (1,134)
Impairment charges of consolidated balances | [1] | 0 | (1,015)
Impairment charges related to EAUs (pre-tax) |  | 0 | (148)
Total impairment charge |  | 0 | (1,163)
Taxation (including related to EAUs) |  | 0 | 130
Total impairment in the income statement |  | 0 | (1,033)
Intangible assets |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Total impairment charge |  | 0 | (4)
Property, plant and equipment |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Total impairment charge |  | 0 | (1,011)
Investment in equity accounted units ('EAUs') |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Total impairment charge |  | 0 | (119)
Aluminium, Alumina and Bauxite | Pacific Aluminum |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Total impairment charge |  | 0 | (489)
Aluminium, Alumina and Bauxite | ISAL |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Total impairment charge |  | 0 | (204)
Minerals | Diavik |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Total impairment charge |  | $ 0 | $ (441)
[1] | Refer to Impairment charges note on pages F-13 and F-14.

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