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Business Combination - Summary of Purchase Consideration and the Provisional Fair Value of Goodwill Identifiable Assets and Liabilities of BHPP Acquired (Detail) - BHP Petroleum International Pty Ltd [member] - USD ($)
$ in Millions
Dec. 31, 2022
Jun. 01, 2022
Disclosure of detailed information about business combination [line items]    
Cash and cash equivalents $ 399  
Receivables 1,164  
Inventories 295  
Investments accounted for using the equity method 267  
Other financial assets 59  
Other assets 114  
Exploration and evaluation assets 180  
Oil and gas properties 19,353  
Lease assets 142  
Payables (910)  
Provisions (4,804)  
Tax payable (365)  
Deferred tax liabilities (576)  
Lease liabilities (268)  
Other liabilities (1,054)  
Net identifiable assets acquired 13,996  
Goodwill arising on acquisition 4,614  
Purchase Consideration 18,610  
Purchase consideration    
Shares issued, at fair value 19,265 $ 19,265
Other reserves (share replacement awards) 18  
Provisional locked box payment received (683)  
Adjustments to locked box payment 10  
Total purchase consideration $ 18,610