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Impairment Of Exploration And Evaluation And Oil And Gas Properties - Summary of Impairment Loss Recognized Or Reversed For Cash Generating Unit (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Recoverable amount   $ 19,899
Impairment reversal $ 900 1,058
Producing And Development [member] | Pluto Scarborough [member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Recoverable amount   17,474
Producing [member] | North West Shelf [member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Recoverable amount   2,425
Oil And Gas Properties [member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment reversal 900 1,058
Oil And Gas Properties [member] | WDS Australia Segment [Member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Recoverable amount 3,456  
Oil And Gas Properties [member] | Producing And Development [member] | Pluto Scarborough [member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment reversal   682
Oil And Gas Properties [member] | Producing [member] | North West Shelf [member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment reversal   376
Oil And Gas Properties [member] | Land and buildings [member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment reversal 87 44
Oil And Gas Properties [member] | Land and buildings [member] | Producing And Development [member] | Pluto Scarborough [member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment reversal   42
Oil And Gas Properties [member] | Land and buildings [member] | Producing [member] | North West Shelf [member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment reversal   2
Oil And Gas Properties [member] | Transferred exploration and evaluation [member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment reversal 30 66
Oil And Gas Properties [member] | Transferred exploration and evaluation [member] | Producing And Development [member] | Pluto Scarborough [member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment reversal   53
Oil And Gas Properties [member] | Transferred exploration and evaluation [member] | Producing [member] | North West Shelf [member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment reversal   13
Oil And Gas Properties [member] | Plant and equipment [member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment reversal $ 783 911
Oil And Gas Properties [member] | Plant and equipment [member] | Producing And Development [member] | Pluto Scarborough [member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment reversal   563
Oil And Gas Properties [member] | Plant and equipment [member] | Producing [member] | North West Shelf [member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment reversal   348
Oil And Gas Properties [member] | Projects in development [member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment reversal   37
Oil And Gas Properties [member] | Projects in development [member] | Producing And Development [member] | Pluto Scarborough [member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment reversal   24
Oil And Gas Properties [member] | Projects in development [member] | Producing [member] | North West Shelf [member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment reversal   $ 13