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Exceptional Items - Summary of Exceptional Items by Category (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross | $ (4,470) | $ (1,546) | $ (1,060)
Exceptional items tax | (1,327) | 241 | 242
Exceptional items net | (5,797) | (1,305) | (818)
Samarco dam failure [member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross | (1,087) | (176) | (1,060)
Exceptional items tax | (71) |  |
Exceptional items net | (1,158) | (176) | (1,060)
Impairment of Energy coal assets [Member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross | (1,523) |  |
Exceptional items tax | (651) |  |
Exceptional items net | (2,174) |  |
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
Non-controlling interests [member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross | (34) | (291) |
Exceptional items tax | 10 | 90 |
Exceptional items net | (24) | (201) |
Attributable to BHP shareholders [member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross | (4,436) | (1,255) | (1,060)
Exceptional items tax | (1,337) | 151 | 242
Exceptional items net | (5,773) | (1,104) | $ (818)
COVID-19 related costs [Member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross | (546) | (183) |
Exceptional items tax | 146 | 53 |
Exceptional items net | (400) | (130) |
Cerro Colorado impairment [Member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross |  | (409) |
Exceptional items tax |  | (83) |
Exceptional items net |  | $ (492) |
Impairment of Potash assets [Member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross | (1,314) |  |
Exceptional items tax | (751) |  |
Exceptional items net | $ (2,065) |  |

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