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Taxes - Summary of Effective Income Tax Rate (Parenthetical) (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
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