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Exceptional Items - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Disclosure of exceptional items [line items] |  |  |
Exceptional items net | $ 5,797 | $ 1,305 | $ 818
Samarco dam failure [member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items net | 1,158 | 176 | $ 1,060
Cerro Colorado impairment [Member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items net |  | $ 492 |
Current environmental licence, Expiry date |  | CY2023 |
New South Wales Energy Coal [member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items net | 1,704 |  |
Cerrejón [Member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items net | 470 |  |
Impairment of Potash assets [Member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items net | $ 2,065 |  |

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