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Significant Events - Additional Information (Detail) R$ in Millions |  | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 08, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 BRL (R$) | Nov. 30, 2019 USD ($) | Aug. 08, 2018 BRL (R$) | Jun. 30, 2018 USD ($)
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Impairment losses |  |  | $ 29,000,000 | $ 168,000,000 | $ 264,000,000 |  |  |  |
Income recognised from insurance settlements |  |  | 40,000,000 |  |  |  |  |  |
Samarco dam failure [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Funding provided during the period |  |  | 27,000,000 |  |  |  |  |  |
Impairment losses |  |  | 27,000,000 | 47,000,000 | 96,000,000 |  |  |  |
Provision before tax and after discounting in respect of its obligations under the Framework Agreement |  |  | 1,728,000,000 |  | 1,914,000,000 |  |  |  | $ 1,285,000,000
Utilisation of the Samarco dam failure provision |  |  | $ 177,000,000 |  |  |  |  |  |
Samarco dam failure [member] | Framework agreement [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Term of agreement |  |  | 15 years |  |  |  |  |  |
Samarco dam failure [member] | Governance Agreement [member] | Federal public prosecution office claim [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Settlement claim |  | $ 38,000,000,000 | $ 38,000,000,000 |  |  | R$ 155,000 |  | R$ 155,000 |
Samarco dam failure [member] | Preliminary Agreement [member] | Federal public prosecution office claim [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Term of agreement |  | 2 years |  |  |  |  |  |  |
Preliminary agreement suspended amount |  | $ 1,900,000,000 |  |  |  |  |  | R$ 7,700 |
Samarco Mineracao S.A. [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Impairment losses | [1],[2] |  | $ 27,000,000 | $ 47,000,000 | $ 96,000,000 |  |  |  |
Percentage of interest in joint venture investment | [1],[2] |  | 50.00% | 50.00% | 50.00% |  |  |  |
BHP Brasil [member] | Samarco Germano dam decommissioning [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Provision before tax and after discounting in respect of its obligations under the Framework Agreement |  |  | $ 261,000,000 |  | $ 263,000,000 |  |  |  |
Percentage of decommissioning cost |  |  | 50.00% |  |  |  |  |  |
BHP Brasil [member] | Samarco dam failure [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Investment in Samarco |  |  |  |  |  |  |  |  |
BHP Brasil [member] | Samarco dam failure [member] | Framework agreement [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Provision before tax and after discounting in respect of its obligations under the Framework Agreement |  |  | $ 1,500,000,000 |  | $ 1,700,000,000 |  |  |  |
Percentage of remaining costs expected to be incurred by December 2021 |  |  | 70.00% |  |  |  |  |  |
BHP Brasil [member] | Samarco dam failure [member] | Preliminary Agreement [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Interim security amount preliminary agreement |  |  | $ 545,000,000 |  |  | 2,200 |  |  |
Allocation period |  |  | 30 months |  |  |  |  |  |
BHP Brasil [member] | Samarco dam failure [member] | Preliminary Agreement [member] | Insurance bonds [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Interim security amount preliminary agreement |  |  | $ 320,000,000 |  |  | 1,300 |  |  |
BHP Brasil [member] | Samarco dam failure [member] | Preliminary Agreement [member] | Liquid assets [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Interim security amount preliminary agreement |  |  | 25,000,000 |  |  | 100 |  |  |
BHP Brasil [member] | Samarco dam failure [member] | Preliminary Agreement [member] | Charge over assets [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Interim security amount preliminary agreement |  |  | 200,000,000 |  |  | R$ 800 |  |  |
BHP Brasil [member] | Samarco Mineracao S.A. [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Funding provided during the period |  |  | 27,000,000 |  |  |  |  |  |
Dividends received |  |  | 0 |  |  |  |  |  |
Profits available for distribution |  |  | $ 0 |  |  |  |  |  |
Percentage of interest in joint venture investment |  |  | 50.00% |  |  |  |  |  |
BHP Brasil [member] | Samarco Mineracao S.A. [member] | Samarco dam failure [member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Undrawn amount |  |  | $ 44,000,000 |  |  |  |  |  |
Commitments amount |  |  |  |  |  |  | $ 44,000,000 |  |
BHP Brasil [member] | Samarco Mineracao S.A. [member] | Samarco dam failure [member] | Dam Stabilisation And Expert Costs [Member] |  |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |  |
Utilisation of the Samarco dam failure provision |  |  | 8,000,000 |  |  |  |  |  |
Commitments amount |  |  | $ 212,000,000 |  |  |  |  |  |
[1] | Following a change to IAS 28 the loss from working capital funding provided during the period will now be disclosed as an impairment included within the Samarco impairment expense line item and not as an operating loss. Comparative periods have been restated to reflect the change.
[2] | Refer to note 9 Significant events – Samarco dam failure for further information.

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