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Significant Events - Additional Information (Detail) R$ in Millions | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2018 BRL (R$) | Dec. 31, 2018 USD ($) | Aug. 08, 2018 BRL (R$) | Aug. 08, 2018 USD ($) | Jun. 30, 2017 USD ($)
Samarco dam failure [member] |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |
Funding provided during the period | $ 47,000,000 |  |  |  |  |  |  |
Additional share of losses | 47,000,000 | $ 50,000,000 | $ 80,000,000 |  |  |  |  |
Provision before tax and after discounting in respect of its obligations under the Framework Agreement |  |  | 1,285,000,000 |  | $ 1,247,000,000 |  |  | $ 1,057,000,000
Utilisation of the Samarco dam failure provision | 168,000,000 |  | $ 285,000,000 |  |  |  |  |
Samarco dam failure [member] | Dam Stabilisation and Expert Costs [member] |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |
Utilisation of the Samarco dam failure provision | $ 4,000,000 |  |  |  |  |  |  |
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 |  |  |  |  |  | R$ 155,000 | $ 40,000,000,000 |
Samarco dam failure [member] | Preliminary Agreement [member] | Federal public prosecution office claim [member] |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |
Preliminary agreement suspended amount |  |  |  | R$ 7,700 | 2,000,000,000 |  |  |
Samarco Mineracao S.A. [member] |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |
Percentage of interest in joint venture investment | 50.00% | 50.00% | 50.00% |  |  |  |  |
BHP Billiton Brasil Ltda [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 |  |  | $ 1,300,000,000 |  | 1,200,000,000 |  |  |
Percentage of remaining costs expected to be incurred by December 2020 | 55.00% |  |  |  |  |  |  |
BHP Billiton Brasil Ltda [member] | Samarco dam failure [member] | Governance Agreement [member] |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |
Term of agreement | 30 months |  |  |  |  |  |  |
Interim security amount preliminary agreement |  |  |  | 2,200 | 570,000,000 |  |  |
BHP Billiton Brasil Ltda [member] | Samarco dam failure [member] | Governance Agreement [member] | Insurance bonds [Member] |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |
Interim security amount preliminary agreement |  |  |  | 1,300 | 335,000,000 |  |  |
BHP Billiton Brasil Ltda [member] | Samarco dam failure [member] | Governance Agreement [member] | Liquid assets [Member] |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |
Interim security amount preliminary agreement |  |  |  | 100 | 25,000,000 |  |  |
BHP Billiton Brasil Ltda [member] | Samarco dam failure [member] | Governance Agreement [member] | Charge over assets [member] |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |
Interim security amount preliminary agreement |  |  |  | R$ 800 | 205,000,000 |  |  |
BHP Billiton Brasil Ltda [member] | Samarco Mineracao S.A. [member] |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |
Adjustment in joint venture investment |  |  | 0 |  |  |  |  |
Funding provided during the period |  |  | 47,000,000 |  |  |  |  |
Additional share of losses |  |  | 47,000,000 |  |  |  |  |
Dividends received |  |  | 0 |  |  |  |  |
Profits available for distribution |  |  | $ 0 |  |  |  |  |
Percentage of interest in joint venture investment | 50.00% |  |  |  |  |  |  |
BHP Billiton Brasil Ltda [member] | Samarco Mineracao S.A. [member] | Samarco dam failure [member] |  |  |  |  |  |  |  |
Disclosure of significant events [line items] |  |  |  |  |  |  |  |
Undrawn amount | $ 2,000,000 |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |
Utilisation of the Samarco dam failure provision | $ 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 |  |  |  |  | $ 77,000,000 |  |  |

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