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Climate change - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended | 120 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2030 | Jun. 30, 2023 | Jun. 30, 2022
Disclosure Of Climate Change [Line Items] |  |  |  |
Assets (liabilities) | $ (49,120) |  | $ (48,530) |
Property, plant and equipment | 71,629 |  | 71,818 | $ 61,295
Amount By which metallurgical coal assets carrying value of asset exceedsIts estimated valuation | 6,000 |  |  |
Surrender of carbon credits | 1 |  |  |
Carbon credits attributable to intangible assets | 23 |  |  |
Carbon credits surrender obligation | 17 |  |  |
Lease liabilities | 3,116 |  | 3,019 |
Fair value of financial derivatives | 1,610 |  | 1,585 |
Expenditure to support value chain | 30 |  |  |
Increase decrease in rehabilitation provision due to change in the life of mines | 40 |  |  |
Power purchase contract agreements [member] |  |  |  |
Disclosure Of Climate Change [Line Items] |  |  |  |
Lease liabilities | 44 |  |  |
Fair value of financial derivatives | 92 |  | $ 50 |
Operating segments [member] | Coal [member] | New South Wales Energy Coal [member] |  |  |  |
Disclosure Of Climate Change [Line Items] |  |  |  |
Assets (liabilities) | 200 |  |  |
Property, plant and equipment | 540 |  |  |
Provisions and other liabilities | 740 |  |  |
Provisions ​for equitable transition | $ 0 |  |  |
Scenario Forecast [member] |  |  |  |
Disclosure Of Climate Change [Line Items] |  |  |  |
Decrease In Percentage Of Reduction Of Operational GHG Emissions |  | 30.00% |  |
Bottom of range [member] | Operating segments [member] |  |  |  |
Disclosure Of Climate Change [Line Items] |  |  |  |
Discount rate used in current estimate of value in use | 7.00% |  | 7.00% |
Top of range [member] | Operating segments [member] |  |  |  |
Disclosure Of Climate Change [Line Items] |  |  |  |
Discount rate used in current estimate of value in use | 9.50% |  | 9.50% |
Maximum [Member] |  |  |  |
Disclosure Of Climate Change [Line Items] |  |  |  |
Commitments for capital expenditure | $ 4,000 |  |  |

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