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Segment Reporting - Summary of Reportable Segments (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Disclosure of reportable segments [line items] |  |  |
Exceptional impairment losses | $ 409 | $ 0 | $ 0
Exceptional items | (1,453) | (952) | (566)
Other income | 777 | 393 | 247
Group and unallocated items/eliminations [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Exceptional items | 413 | 19 | (27)
Group and unallocated items/eliminations [member] | Samarco dam failure [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Exceptional items | (32) | (31) | (27)
Other income | $ 489 | $ 50 | $ 0

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