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Financial Risk Management - Additional Information (Detail) t in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) t | Jun. 30, 2019 USD ($) t | Jun. 30, 2018 USD ($) | Jun. 30, 2020 CLP ($) t | Jun. 30, 2020 AUD ($) t | Jun. 30, 2020 EUR (€) t | Jun. 30, 2020 GBP (£) t | Dec. 31, 2019 | Jun. 30, 2019 CLP ($) t | Jun. 30, 2019 AUD ($) t | Jun. 30, 2019 EUR (€) t | Jun. 30, 2019 GBP (£) t
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings | $ 23,605,000,000 | $ 24,113,000,000 |  |  |  |  |  |  |  |  |  |
Transfer between fair value hierarchy categories | $ 0 |  |  |  |  |  |  |  |  |  |  |
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% | 87.00% |  |  |  |  |  |  |  |  |  |
Weighted average interest rate payable | USD LIBOR + 2.95 per cent | USD LIBOR + 2.3 per cent |  |  |  |  |  |  |  |  |  |
Debt instrument variable interest rate spread | 2.95% |  |  | 2.95% | 2.95% | 2.95% | 2.95% | 2.30% |  |  |  |
Fair value change on derivatives | $ 422,000,000 | $ 8,000,000 | $ 208,000,000 |  |  |  |  |  |  |  |  |
Interest rate risk [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about 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 | $ 47,000,000 | $ 39,000,000 |  |  |  |  |  |  |  |  |  |
Currency risk [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Reasonable possible change in risk, amount |  |  |  | $ 10 | $ 0.01 | € 0.01 | £ 0.01 |  | $ 10 | $ 0.01 | € 0.01 | £ 0.01
Percentage of net financial liabilities denominated in currency | 80.00% | 82.00% |  |  |  |  |  |  |  |  |  |
Effect on equity and profit after taxation, due to reasonable possible change in risk | $ 12,000,000 | $ 12,000,000 |  |  |  |  |  |  |  |  |  |
Commodity price risk [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about 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 | $ 8,000,000 | $ 55,000,000 |  |  |  |  |  |  |  |  |  |
Commodity price risk [member] | Forward commodity and other derivative contracts [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Net asset fair value | 159,000,000 | 199,000,000 |  |  |  |  |  |  |  |  |  |
Commodity price risk [member] | Significant financial instruments [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Net asset fair value | 180,000,000 | 202,000,000 |  |  |  |  |  |  |  |  |  |
Fair value change on derivatives | $ 22,000,000 | $ 14,000,000 |  |  |  |  |  |  |  |  |  |
Commodity price risk [member] | Provisionally priced contract [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about 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%
Tonnes of copper exposure | t | 301 | 277 |  | 301 | 301 | 301 | 301 |  | 277 | 277 | 277 | 277
Effect on equity and profit after taxation, due to reasonable possible change in risk | $ 134,000,000 | $ 114,000,000 |  |  |  |  |  |  |  |  |  |
Fixed interest rate not swapped to floating rate [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about 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 detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings | $ 4,114,000,000 | $ 3,757,000,000 |  |  |  |  |  |  |  |  |  |

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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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