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Amount available for distribution.

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Percentage of proportion payable to claimants.

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The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery.

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The amount of dividends received.

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Significant Events - Additional Information (Detail) $ in Millions, R$ in Billions	12 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Oct. 31, 2024	Oct. 25, 2024 USD ($)	Oct. 25, 2024 BRL (R$)	Sep. 30, 2024 USD ($)	Sep. 30, 2024 BRL (R$)	Jul. 31, 2024	Jun. 30, 2024 BRL (R$)	Jun. 28, 2024	Jun. 30, 2023 USD ($)
Disclosure of significant events [line items]
Estimated financial effect of contingent liabilities	$ 2,575	$ 2,351
BRL/USD [member]
Disclosure of significant events [line items]
Closing foreign exchange rate										5.56
Samarco Dam Failure Settlement Agreement [member]
Disclosure of significant events [line items]
Percentage of compensation	50.00%
Federal public prosecution office claim [member] \| Samarco Dam Failure Settlement Agreement [member]
Disclosure of significant events [line items]
Estimated financial effect of contingent liabilities				$ 31,700	R$ 170
Percentage of commitment made				100.00%	100.00%
Federal public prosecution office claim [member] \| Compension Paid [member]
Disclosure of significant events [line items]
Estimated financial effect of contingent liabilities						$ 7,900	R$ 38
Federal public prosecution office claim [member] \| Obligation To Pay [member]
Disclosure of significant events [line items]
Estimated financial effect of contingent liabilities						18,000	100
Federal public prosecution office claim [member] \| Obligation To Perform [member]
Disclosure of significant events [line items]
Estimated financial effect of contingent liabilities						$ 5,800	R$ 32
Brazilian Social Contribution Levy [Member]
Disclosure of significant events [line items]
Percentage of interest in joint venture investment	50.00%
Estimated financial effect of contingent liabilities		200
Gross provisions	$ 400	400
Net provisions	200	200
Aggregate court deposit paid	$ 200	200
United Kingdom Group Action Complaint [Member] \| Samarco Dam Failure Settlement Agreement [member]
Disclosure of significant events [line items]
Percentage of compensation			50.00%
United Kingdom Group Action Complaint [Member] \| Vale S.A [Member]
Disclosure of significant events [line items]
Percentage of proportion payable to claimants								50.00%
Samarco dam failure [member]
Disclosure of significant events [line items]
Percentage of charges recognised in Group's results	100.00%
Provision recognized	$ 5,849	6,505									$ 3,681
Percentage of reasonably possible increase in discount rate	0.50%
Increase (decrease) in provision due to reasonably possible increase in discount rate	$ 100
Samarco dam failure [member] \| Samarco Dam Failure Settlement Agreement [member]
Disclosure of significant events [line items]
Maximum funding cap	1,000
Samarco dam failure [member] \| Federal public prosecution office claim [member]
Disclosure of significant events [line items]
Estimated financial effect of contingent liabilities \| R$									R$ 155
Samarco non dam failure [member} \| Brazilian Mining Royalties [member]
Disclosure of significant events [line items]
Estimated financial effect of contingent liabilities	$ 400	$ 400
Samarco Mineracao S.A. [member]
Disclosure of significant events [line items]
Percentage of interest in joint venture investment	50.00%	50.00%
Samarco Mineracao S.A. [member] \| Brazilian Corporate Income Tax Rate [Member]
Disclosure of significant events [line items]
Estimated financial effect of contingent liabilities	$ 1,000	$ 1,000
Samarco Mineracao S.A. [member] \| Samarco dam failure [member] \| Framework agreement [member]
Disclosure of significant events [line items]
Provision recognized	100	$ 400
BHP Brasil Ltda [member] \| United Kingdom Group Action Complaint [Member]
Disclosure of significant events [line items]
Percentage of proportion payable to claimants								50.00%
BHP Brasil Ltda [member] \| Samarco dam failure [member] \| Maximum [Member] \| Samarco Dam Failure Settlement Agreement [member]
Disclosure of significant events [line items]
Funding commitments amount	2,900
BHP Brasil Ltda [member] \| Samarco Mineracao S.A. [member]
Disclosure of significant events [line items]
Investment in Samarco	0
Dividends received	0
Profits available for distribution	$ 0
Percentage of interest in joint venture investment	50.00%