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Financial Risk Management - Additional Information (Detail) t in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) t | Jun. 30, 2018 USD ($) t | Jun. 30, 2019 AUD ($) t | Jun. 30, 2019 CLP ($) t | Jun. 30, 2019 EUR (€) t | Jun. 30, 2019 GBP (£) t | Jun. 30, 2018 AUD ($) t | Jun. 30, 2018 CLP ($) t | Jun. 30, 2018 EUR (€) t | Jun. 30, 2018 GBP (£) t
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Cash Flow at Risk period of worst expected loss relative to projected business plan cash flows |  | 1 year |  |  |  |  |  |  |  |  |
Principal measurement of risk, confidence level |  | 90.00% |  |  |  |  |  |  |  |  |
Percentage of borrowings exposed to floating interest rate |  | 87.00% | 89.00% |  |  |  |  |  |  |  |
Borrowings |  | $ 24,113,000,000 | $ 26,003,000,000 |  |  |  |  |  |  |  |
TransferBetweenFairValueHierarchyCategories | $ 0 |  |  |  |  |  |  |  |  |  |
Weighted average interest rate payable |  | USD LIBOR + 2.3% |  |  |  |  |  |  |  |  |
Fixed interest rate not swapped to floating rate [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings |  | $ 3,019,000,000 | 3,019,000,000 |  |  |  |  |  |  |  |
Fixed interest rate not swapped to floating rate [member] | At fair value [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings |  | $ 3,757,000,000 | $ 3,434,000,000 |  |  |  |  |  |  |  |
Interest rate risk [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Reasonable possible change in risk, percentage |  | 1.00% | 1.00% | 1.00% | 1.00% | 1.00% | 1.00% | 1.00% | 1.00% | 1.00% | 1.00%
Effect on equity and profit after taxation, due to reasonable possible change in risk |  | $ (39,000,000) | $ (54,000,000) |  |  |  |  |  |  |  |
Currency risk [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Effect on equity and profit after taxation, due to reasonable possible change in risk |  | $ (12,000,000) | $ (10,000,000) |  |  |  |  |  |  |  |
Percentage of net financial liabilities denominated in currency |  | 82.00% | 88.00% |  |  |  |  |  |  |  |
Reasonable possible change in risk, amount |  |  |  | $ 0.01 | $ 10 | € 0.01 | £ 0.01 | $ 0.01 | $ 10 | € 0.01 | £ 0.01
Commodity price risk [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Reasonable possible change in risk, percentage |  | 10.00% | 10.00% | 10.00% | 10.00% | 10.00% | 10.00% | 10.00% | 10.00% | 10.00% | 10.00%
Effect on equity and profit after taxation, due to reasonable possible change in risk |  | $ 55,000,000 | $ 9,000,000 |  |  |  |  |  |  |  |
Commodity price risk [member] | Forward commodity and other derivative contracts [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Net asset fair value |  | 199,000,000 | 210,000,000 |  |  |  |  |  |  |  |
Commodity price risk [member] | Significant financial instruments [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Net asset fair value |  | $ 202,000,000 | $ 216,000,000 |  |  |  |  |  |  |  |
Commodity price risk [member] | Provisionally priced contract [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Reasonable possible change in risk, percentage |  | 10.00% | 10.00% | 10.00% | 10.00% | 10.00% | 10.00% | 10.00% | 10.00% | 10.00% | 10.00%
Effect on equity and profit after taxation, due to reasonable possible change in risk |  | $ 114,000,000 | $ 178,000,000 |  |  |  |  |  |  |  |
Tonnes of copper exposure | t |  | 277 | 356 | 277 | 277 | 277 | 277 | 356 | 356 | 356 | 356

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- Definition Cash Flow at Risk period of worst expected loss relative to projected business plan cash flows. + References No definition available. + Details
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- Definition Level of confidence use in our A Cash Flow at Risk (CFaR) framework is used to measure the aggregate and diversified impact of financial risks upon the Group's financial targets. The principal measurement of risk is CFaR measured on a portfolio basis, which is defined as the worst expected loss relative to projected business plan cash flows over a one-year horizon under normal market conditions at a confidence level of 90 per cent. + References No definition available. + Details
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