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Segment Reporting - Summary of Reportable Segments (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Disclosure of reportable segments [line items] |  |  |
Exceptional items excluded from depreciation and amortisation |  |  | $ 212
Exceptional items excluded from impairment losses |  |  | 5
Exceptional items | (952) | (566) | (636)
Other income | 393 | 247 | 662
Group and unallocated items/eliminations [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Exceptional items | 19 | (27) | (51)
Group and unallocated items/eliminations [member] | Samarco dam failure [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Exceptional items | (31) | (27) | (51)
Other income | $ 50 |  |

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