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Exceptional Items - Summary of Exceptional Items by Category (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross | $ (1,546) | $ (1,060) | $ (650)
Exceptional items tax | 241 | 242 | (2,320)
Exceptional items net | (1,305) | (818) | (2,970)
Samarco dam failure [member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross | (176) | (1,060) | (650)
Exceptional items tax | 0 | 0 | 0
Exceptional items net | (176) | (1,060) | (650)
Cancellation Of Power Contracts [Member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross | (778) |  |
Exceptional items tax | 271 |  |
Exceptional items net | (507) |  |
Global taxation matters [member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items tax |  | 242 |
Exceptional items net |  | 242 |
US tax reform [member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items tax |  |  | (2,320)
Exceptional items net |  |  | (2,320)
Non-controlling interests [member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross | (291) |  |
Exceptional items tax | 90 |  |
Exceptional items net | (201) |  |
Attributable to BHP shareholders [member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross | (1,255) | (1,060) | (650)
Exceptional items tax | 151 | 242 | (2,320)
Exceptional items net | (1,104) | $ (818) | $ (2,970)
COVID-19 related costs [Member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross | (183) |  |
Exceptional items tax | 53 |  |
Exceptional items net | (130) |  |
Cerro Colorado impairment [Member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross | (409) |  |
Exceptional items tax | (83) |  |
Exceptional items net | $ (492) |  |

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