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Significant Events - Additional Information (Detail) |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 08, 2018 | Aug. 06, 2018 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2018 BRL (R$) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2018 BRL (R$) | Jun. 29, 2018 USD ($) | Jun. 25, 2018 USD ($) | Jun. 25, 2018 BRL (R$)
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
Funding provided during the period |  |  | $ 142,000,000 |  |  |  |  |  |  |
Settlement claim |  |  | $ 3,503,000,000 |  | $ 3,609,000,000 |  |  |  |  |
Samarco dam failure [member] |  |  |  |  |  |  |  |  |  |
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
Percentage of charges recognised in Group's results |  |  | 100.00% | 100.00% |  |  |  |  |  |
Funding provided during the period |  |  | $ 80,000,000 |  |  |  |  |  |  |
Additional share of losses |  |  | 80,000,000 |  | 134,000,000 | $ 655,000,000 |  |  |  |
Provision before tax and after discounting in respect of its obligations under the Framework Agreement |  |  | 1,285,000,000 |  | 1,057,000,000 | 1,200,000,000 |  |  |  |
Provision paid |  |  | 285,000,000 |  | $ 308,000,000 |  |  |  |  |
Samarco dam failure [member] | Dam Stabilisation and Expert Costs [member] |  |  |  |  |  |  |  |  |  |
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
Provision paid |  |  | 4,000,000 |  |  |  |  |  |  |
Samarco dam failure [member] | State Prosecutors in Minas Gerais [member] |  |  |  |  |  |  |  |  |  |
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
Settlement claim |  |  | 2,000,000,000 |  |  |  | R$ 7,500,000,000 |  |  |
Samarco dam failure [member] | State Prosecutors in Esprito Santo [member] |  |  |  |  |  |  |  |  |  |
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
Settlement claim |  |  | 520,000,000 |  |  |  | 2,000,000,000 |  |  |
Samarco dam failure [member] | Public defenders in Minas Gerais [member] |  |  |  |  |  |  |  |  |  |
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
Settlement claim |  |  | 2,600,000,000 |  |  |  | 10,000,000,000 |  |  |
Samarco dam failure [member] | Preliminary Agreement [member] | Federal public prosecution office claim [member] |  |  |  |  |  |  |  |  |  |
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
Preliminary agreement suspended amount |  |  | $ 2,000,000,000 | R$ 7,700,000,000 |  |  |  |  |  |
Samarco dam failure [member] | Framework agreement [member] |  |  |  |  |  |  |  |  |  |
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
Term of agreement |  |  | 15 years | 15 years |  |  |  |  |  |
Samarco dam failure [member] | Governance Agreement [member] | Public civil claim [member] |  |  |  |  |  |  |  |  |  |
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
Settlement claim |  |  |  |  |  |  |  |  | $ 5,200,000,000 | R$ 20,000,000,000
Preliminary agreement suspended amount |  |  | $ 310,000,000 | R$ 1,200,000,000 |  |  |  |  |  |
Samarco dam failure [member] | Governance Agreement [member] | Federal public prosecution office claim [member] |  |  |  |  |  |  |  |  |  |
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
Settlement claim |  |  |  |  |  |  |  |  | $ 40,000,000,000 | R$ 155,000,000,000
Suspension period of claim | 2 years |  |  |  |  |  |  |  |  |
Settlement agreement [member] | United States class action complaint [member] |  |  |  |  |  |  |  |  |  |
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
In-principle settlement agreement amount |  | $ 50,000,000 |  |  |  |  |  |  |  |
Samarco Mineracao S.A. [member] |  |  |  |  |  |  |  |  |  |
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
Percentage of interest in joint venture investment |  |  | 50.00% | 50.00% | 50.00% |  |  |  |  |
Additional share of losses |  |  |  |  |  | $ 655,000,000 |  |  |  |
Samarco Mineracao S.A. [member] | Framework agreement [member] |  |  |  |  |  |  |  |  |  |
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
Commitments |  |  | $ 1,878,000,000 |  |  |  |  |  |  |
Samarco Mineracao S.A. [member] | Samarco dam failure [member] |  |  |  |  |  |  |  |  |  |
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
Provision paid |  |  | 200,000,000 |  | $ 300,000,000 |  |  |  |  |
Commitments |  |  | 1,100,000,000 |  | 1,500,000,000 |  |  |  |  |
Samarco Mineracao S.A. [member] | Samarco dam failure [member] | Brazilian Social Contribution Levy [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
Settlement claim |  |  | 1,400,000,000 |  |  |  | 5,400,000,000 |  |  |
Samarco Mineracao S.A. [member] | Samarco dam failure [member] | Brazilian corporate income tax rate [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
Settlement claim |  |  | 1,100,000,000 |  |  |  | R$ 4,200,000,000 |  |  |
Samarco Mineracao S.A. [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 |  |  | 2,600,000,000 |  | 2,100,000,000 |  |  |  |  |
BHP Billiton Brasil Ltda [member] | Samarco dam failure [member] | Preliminary Agreement [member] | Insurance bonds [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
Interim security amount preliminary agreement |  |  | 335,000,000 | R$ 1,300,000,000 |  |  |  |  |  |
BHP Billiton Brasil Ltda [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 | 100,000,000 |  |  |  |  |  |
BHP Billiton Brasil Ltda [member] | Samarco dam failure [member] | Preliminary Agreement [member] | Charge over assets [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
Interim security amount preliminary agreement |  |  | 210,000,000 | 800,000,000 |  |  |  |  |  |
BHP Billiton Brasil Ltda [member] | Samarco dam failure [member] | Preliminary Agreement [member] | Allocated within next four years [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
Interim security amount preliminary agreement |  |  | $ 50,000,000 | R$ 200,000,000 |  |  |  |  |  |
Allocation period |  |  | 4 years | 4 years |  |  |  |  |  |
BHP Billiton Brasil Ltda [member] | Samarco dam failure [member] | Framework agreement [member] |  |  |  |  |  |  |  |  |  |
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
Announced funding obligations under the Framework Agreement |  |  |  |  |  |  |  | $ 158,000,000 |  |
Provision before tax and after discounting in respect of its obligations under the Framework Agreement |  |  | $ 1,300,000,000 |  | $ 1,100,000,000 |  |  |  |  |
Percentage of remaining costs expected to be incurred by December 2020 |  |  | 65.00% | 65.00% |  |  |  |  |  |
BHP Billiton Brasil Ltda [member] | Samarco dam failure [member] | Governance Agreement [member] |  |  |  |  |  |  |  |  |  |
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
Term of agreement |  |  | 30 months | 30 months |  |  |  |  |  |
BHP Billiton Brasil Ltda [member] | Samarco dam failure [member] | Governance Agreement [member] | Top of range [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
Interim security amount preliminary agreement |  |  | $ 570,000,000 | R$ 2,200,000,000 |  |  |  |  |  |
BHP Billiton Brasil Ltda [member] | Samarco Mineracao S.A. [member] |  |  |  |  |  |  |  |  |  |
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
Percentage of interest in joint venture investment |  |  | 50.00% | 50.00% |  |  |  |  |  |
Adjustment in joint venture investment |  |  |  |  |  |  |  |  |  |
Funding provided during the period |  |  | 80,000,000 |  |  |  |  |  |  |
Additional share of losses |  |  | 80,000,000 |  |  |  |  |  |  |
Dividends received |  |  | 0 |  |  |  |  |  |  |
Profits available for distribution |  |  | 0 |  |  |  |  |  |  |
BHP Billiton Brasil Ltda [member] | Samarco Mineracao S.A. [member] | Samarco dam failure [member] |  |  |  |  |  |  |  |  |  |
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
Undrawn amount |  |  | 16,000,000 |  |  |  |  |  |  |
BHP Billiton Brasil Ltda [member] | Samarco Mineracao S.A. [member] | Samarco dam failure [member] | Dam Stabilisation and Expert Costs [member] |  |  |  |  |  |  |  |  |  |
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
Provision paid |  |  | 4,000,000 |  |  |  |  |  |  |
BHP Billiton Brasil Ltda [member] | Samarco Mineracao S.A. [member] | Samarco dam failure [member] | Short-term facility [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of significant events [Line items] |  |  |  |  |  |  |  |  |  |
Commitments |  |  | $ 53,000,000 |  |  |  |  |  |  |

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