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Discontinued Operations - Summary of Net Gain Loss on Merger (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2023
Disclosure In Tabular Form Of Net Gain Loss On Merger [Line Items]    
Net assets disposed $ 48,766 $ 48,530
Net cash completion payment on merger of Petroleum with Woodside (683)  
Discontinued operations [member]    
Disclosure In Tabular Form Of Net Gain Loss On Merger [Line Items]    
Net assets disposed 10,172  
Fair value of Woodside shares 19,566  
Net cash completion payment on merger of Petroleum with Woodside (683)  
Foreign currency translation reserve transferred to the income statement 54  
Other provisions and related indemnities recognised at completion (353)  
Transaction and other directly attributable costs (245)  
Income tax expense (8)  
Net gain on Petroleum merger with Woodside $ 8,159