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Exceptional Items - Additional Information (Detail) - USD ($) $ in Millions |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 02, 2024 | Oct. 18, 2023 | May 17, 2023 | May 03, 2022 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022 | Nov. 03, 2022
Disclosure of exceptional items [line items] |  |  |  |  |  |  |  |
Exceptional items net |  |  |  |  | $ 5,763.0 | $ 606.0 | $ 1,074.0 |
Portion of consideration paid (received) consisting of cash and cash equivalents |  |  |  |  |  |  | 683.0 |
Impairment of Western Australia Nickel assets [member] |  |  |  |  |  |  |  |
Disclosure of exceptional items [line items] |  |  |  |  |  |  |  |
Exceptional items net |  |  |  |  | 2,675.0 |  |  |
Chilean tax reform [member] |  |  |  |  |  |  |  |
Disclosure of exceptional items [line items] |  |  |  |  |  |  |  |
Exceptional items net |  |  |  |  |  | 283.0 |  |
Tax rate royalty on revenue |  |  | 1.00% |  |  |  |  |
Tax Rate Effect Of Revenues Exempt From Taxation |  |  | 46.50% |  |  |  |  |
Deferred tax position remeasured |  |  |  |  |  | 283.0 |  |
Chilean tax reform [member] | Bottom of range [member] |  |  |  |  |  |  |  |
Disclosure of exceptional items [line items] |  |  |  |  |  |  |  |
Tax rate royalty on margin |  |  | 8.00% |  |  |  |  |
Chilean tax reform [member] | Top of range [member] |  |  |  |  |  |  |  |
Disclosure of exceptional items [line items] |  |  |  |  |  |  |  |
Tax rate royalty on margin |  |  | 26.00% |  |  |  |  |
Samarco dam failure [member] |  |  |  |  |  |  |  |
Disclosure of exceptional items [line items] |  |  |  |  |  |  |  |
Exceptional items net |  |  |  |  | 3,762.0 | $ 323.0 | 1,063.0 |
Impairment of US Deferred Tax Assets [Member] |  |  |  |  |  |  |  |
Disclosure of exceptional items [line items] |  |  |  |  |  |  |  |
Exceptional items net |  |  |  |  |  |  | 423.0 |
Blackwater and Daunia gain on divestment [member] |  |  |  |  |  |  |  |
Disclosure of exceptional items [line items] |  |  |  |  |  |  |  |
Exceptional items net |  |  |  |  | (674.0) |  |  |
Cash flows from losing control of subsidiaries or other businesses | $ 2,000.0 |  |  |  |  |  |  |
Proceeds from divestiture of interest in a subsidiary towards preliminary completion adjustment | 44.1 |  |  |  |  |  |  |
Deferred consideration | $ 1,100.0 |  |  |  | 495.0 |  |  |
Proportion of ownership interest in joint venture | 50.00% |  |  |  |  |  |  |
Bma percentage basis | 100.00% |  |  |  |  |  |  |
Deposit on signing of the asset sale agreement |  | $ 100.0 |  |  |  |  |  |
Deferred consideration term | 3 years |  |  |  |  |  |  |
Price linked earnout amount receivable term | 3 years |  |  |  |  |  |  |
Price linked earnout subject to cap value | $ 350.0 |  |  |  |  |  |  |
Average realized pricing exeeding agreed thresholds term | 3 years |  |  |  |  |  |  |
Portion of consideration paid (received) consisting of cash and cash equivalents | $ 4,100.0 |  |  |  | $ 1,072.0 |  |  |
Blackwater and Daunia gain on divestment [member] | Top of range [member] |  |  |  |  |  |  |  |
Disclosure of exceptional items [line items] |  |  |  |  |  |  |  |
Deferred Price linked earnout consideration receivable on divestiture of interest in a subsidiary | $ 900.0 |  |  |  |  |  |  |
BHP Mitsui Coal or BMC Gain on Disposal [Member] |  |  |  |  |  |  |  |
Disclosure of exceptional items [line items] |  |  |  |  |  |  |  |
Exceptional items net |  |  |  |  |  |  | $ (840.0) |
BHP Mitsui Coal or BMC Gain on Disposal [Member] | BHP Mitsui Coal Pty Ltd [member] |  |  |  |  |  |  |  |
Disclosure of exceptional items [line items] |  |  |  |  |  |  |  |
Cash flows from losing control of subsidiaries or other businesses |  |  |  | $ 1,100.0 |  |  |  |
Proceeds from divestiture of interest in a subsidiary towards preliminary completion adjustment |  |  |  | 218.0 |  |  |  |
Deferred consideration received on divestiture of interest in a subsidiary |  |  |  |  |  |  |  | $ 100.0
Deferred Price linked earnout consideration receivable on divestiture of interest in a subsidiary |  |  |  | $ 150.0 |  |  |  |
Group's interest |  |  |  | 80.00% |  |  |  |
Price linked earn out payable year |  |  |  |  |  |  | 2024 calendar year |
Deferred Price Linked Earnout Discounted on Divestiture of Interest in a Subsidiary |  |  |  | $ 122.0 |  |  |  |
Deferred consideration |  |  |  | $ 222.0 |  |  | $ 222.0 |
Portion of consideration paid (received) consisting of cash and cash equivalents |  |  |  |  |  |  | $ 1,318.0 |

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