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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, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2020 BRL (R$) | Dec. 31, 2019 USD ($) | Nov. 30, 2019 USD ($) | Aug. 08, 2018 BRL (R$)
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Funding provided during the period |  |  | $ 242 |  |  |  |  |  |
Impairment losses |  |  | 494 | $ 264 | $ 333 |  |  |  |
Settlement claim |  | $ 2,848 | 2,848 | 3,443 |  |  |  |  |
Income recognised from insurance settlements |  |  | $ 489 |  |  |  |  |  |
Samarco dam failure [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Percentage of charges recognised in Group's results |  |  | 100.00% |  |  |  |  |  |
Impairment losses |  |  | $ 95 | 96 | 80 |  |  |  |
Provision in addition to obligations under the Framework Agreement |  | 2,051 | 2,051 | $ 1,914 | $ 1,285 |  |  |  |
Samarco dam failure [member] | State Prosecutors in Minas Gerais [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Settlement claim |  | 1,400 | 1,400 |  |  | R$ 7,500 |  |  |
Samarco dam failure [member] | State Prosecutors in Esprito Santo [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Settlement claim |  | 365 | 365 |  |  | 2,000 |  |  |
Samarco dam failure [member] | Public defenders in Minas Gerais [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Settlement claim |  | 1,800 | $ 1,800 |  |  | 10,000 |  |  |
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 | $ 28,000 | 28,000 | $ 28,000 |  |  | 155,000 |  |  | R$ 155,000
Preliminary agreement suspended amount | $ 1,400 |  |  |  |  |  |  |  | R$ 7,700
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 | $ 400 | $ 500 |  |  |  |  |
Samarco Mineracao S.A. [member] | Samarco dam failure [member] | Brazilian Social Contribution Levy [Member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Settlement claim |  | 1,000 | 1,000 |  |  | 5,500 |  |  |
Samarco Mineracao S.A. [member] | Samarco dam failure [member] | Brazilian Corporate Income Tax Rate [Member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Settlement claim |  | 800 | 800 |  |  | 4,500 |  |  |
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 |  |  | $ 227 | 263 |  |  |  |  |
Percentage of decommissioning cost |  |  | 50.00% |  |  |  |  |  |
BHP Brasil Ltda [member] | Samarco dam failure [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Funding provided during the period |  |  | $ 0 |  |  |  |  |  |
Impairment losses |  |  | 0 |  |  |  |  |  |
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 | 1,800 | 1,700 |  |  |  |  |
Interim security amount preliminary agreement |  | 400 | $ 400 |  |  | 2,200 |  |  |
Allocation period |  |  | 30 months |  |  |  |  |  |
Percentage of remaining costs expected to be incurred by December 2021 |  |  | 75.00% |  |  |  |  |  |
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 |  | 240 | $ 240 |  |  | 1,300 |  |  |
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 |  | 145 | 145 |  |  | 800 |  |  |
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 | 20 |  |  | R$ 100 |  |  |
BHP Brasil Ltda [member] | Samarco Mineracao S.A. [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Investment in Samarco |  | 0 | 0 |  |  |  |  |  |
Dividends received |  |  | 0 |  |  |  |  |  |
Profits available for distribution |  | 0 | $ 0 |  |  |  |  |  |
Percentage of interest in joint venture investment |  |  | 50.00% |  |  |  |  |  |
Commitments |  | 200 | $ 200 | $ 250 |  |  |  |  |
Payment of approved amount to jointventure |  | $ 68 |  |  |  |  |  |  |
BHP Brasil Ltda [member] | Samarco Mineracao S.A. [member] | Samarco dam failure [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Commitments amount |  |  |  |  |  |  |  | $ 44 |
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 |  |  |  |  |  |  | $ 212 |  |

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