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Taxes - Summary of Effective Income Tax Rate (Parenthetical) (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
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Jun. 30, 2030 | Jun. 30, 2029 | Jun. 30, 2028 | Jun. 30, 2027 | Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2023
Disclosure Of Effective Income Tax Rate [Line Items] |  |  |  |  |  |  |  |
Taxable Profit Percentage | 10 |  |  |  |  |  |  |
JERA Scarborough Pty Ltd [Member] |  |  |  |  |  |  |  |
Disclosure Of Effective Income Tax Rate [Line Items] |  |  |  |  |  |  |  |
Tax benefit arising from previously unrecognised tax loss, tax credit or temporary difference of prior period used to reduce deferred tax expense |  |  |  |  |  | $ 61 |  |
Recognized tax benefit |  |  |  |  |  |  | $ 91 |
Bottom of range [member] | JERA Scarborough Pty Ltd [Member] |  |  |  |  |  |  |  |
Disclosure Of Effective Income Tax Rate [Line Items] |  |  |  |  |  |  |  |
Applicable tax rate |  |  |  | 6.90% |  |  |  |
Top of range [member] | JERA Scarborough Pty Ltd [Member] |  |  |  |  |  |  |  |
Disclosure Of Effective Income Tax Rate [Line Items] |  |  |  |  |  |  |  |
Applicable tax rate |  |  |  |  | 25.60% |  |  |
Pluto and Wheatstone [Member] |  |  |  |  |  |  |  |
Disclosure Of Effective Income Tax Rate [Line Items] |  |  |  |  |  |  |  |
Current Tax Payable |  |  |  |  |  |  | 124 |
Trion [Member] |  |  |  |  |  |  |  |
Disclosure Of Effective Income Tax Rate [Line Items] |  |  |  |  |  |  |  |
Recognition of deferred tax asset |  |  | $ 319 |  |  |  |  |
Trion [Member] | Bottom of range [member] |  |  |  |  |  |  |  |
Disclosure Of Effective Income Tax Rate [Line Items] |  |  |  |  |  |  |  |
Applicable tax rate | 13.90% |  |  |  |  |  |  |
Trion [Member] | Top of range [member] |  |  |  |  |  |  |  |
Disclosure Of Effective Income Tax Rate [Line Items] |  |  |  |  |  |  |  |
Applicable tax rate |  | 29.60% |  |  |  |  |  |
Sangomar [Member] | JERA Scarborough Pty Ltd [Member] | Achieving First Oil On The Project [Member] |  |  |  |  |  |  |  |
Disclosure Of Effective Income Tax Rate [Line Items] |  |  |  |  |  |  |  |
Income tax relating to components of other comprehensive income |  |  |  |  |  |  | $ 305 |
Scarborough [Member] |  |  |  |  |  |  |  |
Disclosure Of Effective Income Tax Rate [Line Items] |  |  |  |  |  |  |  |
Percentage of Scarborough JV interest sold |  |  |  |  |  |  |  | 10.00%
Scarborough [Member] | JERA Scarborough Pty Ltd [Member] |  |  |  |  |  |  |  |
Disclosure Of Effective Income Tax Rate [Line Items] |  |  |  |  |  |  |  |
Percentage of Scarborough JV interest sold |  |  |  |  |  |  | 15.10% |
Recognized tax benefit |  |  |  |  |  |  | $ 91 |

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