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Significant Events - Additional Information (Detail) R$ in Millions, $ in Millions |  | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 08, 2018 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2021 BRL (R$) | Dec. 31, 2019 USD ($) | Nov. 30, 2019 USD ($) | Aug. 08, 2018 BRL (R$)
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Funding provided during the period |  |  | $ 219 |  |  |  |  |  |
Impairment losses |  |  | 2,635 | $ 494 | $ 264 |  |  |  |
Settlement claim |  | $ 2,848 | 3,147 | 2,848 |  |  |  |  |
Income recognised from insurance settlements |  |  | $ 573 |  |  |  |  |  |
Termination of criminal charges against affected individuals by the federal court |  |  | 8 |  |  |  |  |  |
Appeal against termination of criminal charges still pending in federal court |  |  | 7 |  |  |  |  |  |
Samarco dam failure [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Percentage of charges recognised in Group's results |  |  | 100.00% |  |  |  |  |  |
Impairment losses |  |  | $ 111 | 95 | 96 |  |  |  |
Provision in addition to obligations under the Framework Agreement |  | 2,051 | 2,792 | 2,051 | $ 1,914 |  |  |  |
Samarco dam failure [member] | State Prosecutors in Minas Gerais [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Settlement claim |  |  | 1,500 |  |  | R$ 7,500.0 |  |  |
Samarco dam failure [member] | State Prosecutors in Esprito Santo [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Settlement claim |  |  | $ 400 |  |  | 2,000.0 |  |  |
Samarco dam failure [member] | Public defenders in Minas Gerais [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Settlement claim |  | 2,000 |  | $ 2,000 |  | 10,000.0 |  |  |
Samarco dam failure [member] | Framework agreement [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Term of agreement |  |  | 15 years |  |  |  |  |  |
Term of agreement renewable |  |  | 1 year |  |  |  |  |  |
Samarco dam failure [member] | Governance Agreement [member] | Federal public prosecution office claim [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Term of agreement | 2 years |  |  |  |  |  |  |  |
Settlement claim |  |  | $ 30,000 |  |  | 155,000.0 |  |  |
Preliminary agreement suspended amount | $ 1,500 |  |  |  |  |  |  |  | R$ 7,700.0
Samarco dam failure [member] | Governance Agreement [member] | Federal public prosecution office claim [member] | Definitive And Substantive Settlement Obligation Member [Member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Settlement claim |  |  | $ 30,000 |  |  | 155,000.0 |  |  |
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] | Samarco dam failure [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Commitments |  | 400 | $ 700 | $ 400 |  |  |  |  |
Samarco Mineracao S.A. [member] | Samarco dam failure [member] | Brazilian Social Contribution Levy [Member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Settlement claim |  | 1,200 | 1,200 | 1,200 |  | 5,900.0 |  |  |
Samarco Mineracao S.A. [member] | Samarco dam failure [member] | Brazilian Corporate Income Tax Rate [Member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Settlement claim |  | 900 | 900 | 900 |  | 4,600.0 |  |  |
Samarco Mineracao S.A. [member] | Samarco dam failure [member] | Framework agreement [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Provision in addition to obligations under the Framework Agreement |  | 200 | 200 | 200 |  |  |  |  |
BHP Brasil Ltda [member] | Samarco Germano dam decommissioning [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Provision |  |  | $ 232 | 227 |  |  |  |  |
Percentage of decommissioning cost |  |  | 50.00% |  |  |  |  |  |
BHP Brasil Ltda [member] | Framework agreement [member] | Insurance bonds [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Interim security amount preliminary agreement |  |  | $ 260 |  |  | 1.3 |  |  |
BHP Brasil Ltda [member] | Samarco dam failure [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Funding provided during the period |  |  | 111 |  |  |  |  |  |
Impairment losses |  |  | 111 |  |  |  |  |  |
BHP Brasil Ltda [member] | Samarco dam failure [member] | Framework agreement [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Provision in addition to obligations under the Framework Agreement |  | 1,800 | $ 2,600 | 1,800 |  |  |  |  |
Percentage of remaining costs expected to be incurred by December 2021 |  |  | 85.00% |  |  |  |  |  |
BHP Brasil Ltda [member] | Samarco dam failure [member] | Framework agreement [member] | Insurance bonds [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Interim security amount preliminary agreement |  |  | $ 440 |  |  | 2,200.0 |  |  |
BHP Brasil Ltda [member] | Samarco dam failure [member] | Framework agreement [member] | Charge over assets [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Interim security amount preliminary agreement |  |  | 160 |  |  | 800.0 |  |  |
BHP Brasil Ltda [member] | Samarco dam failure [member] | Framework agreement [member] | Liquid assets [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Interim security amount preliminary agreement |  |  | 20 |  |  | R$ 100.0 |  |  |
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% |  |  |  |  |  |
Commitments |  | 200 | $ 350 | $ 200 |  |  |  |  |
Payment of approved amount to jointventure |  | $ 40 |  |  |  |  |  |  |
BHP Brasil Ltda [member] | Samarco Mineracao S.A. [member] | Samarco dam failure [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Commitments amount |  |  |  |  |  |  |  | $ 765 |
BHP Brasil Ltda [member] | Samarco Mineracao S.A. [member] | Samarco dam failure [member] | Dam Stabilisation And Expert Costs [Member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Commitments amount |  |  |  |  |  |  | $ 725 |  |

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