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Impairment Of Exploration And Evaluation And Oil And Gas Properties - Summary of Sensitivity Analysis of Fair Value Measurement To Changes In Unobservable Inputs, Assets Oil And Gas Properties (Detail) - Producing [member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Wheatstone [member]    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets oil and gas properties [line items]    
Increase $ 116  
Decrease $ (43)  
Discount rate, measurement input [member] | Oil And Gas Properties [member] | Wheatstone [member]    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets oil and gas properties [line items]    
Increase [1],[2],[3]   $ (159)
Decrease [3]   178
Discount rate, measurement input [member] | Oil And Gas Properties [member] | NWS Oil Okha [member]    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets oil and gas properties [line items]    
Increase [1],[2],[3]   (4)
Decrease [3]   4
Brent Price Measurement Input [member] | Oil And Gas Properties [member] | North West Shelf [member]    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets oil and gas properties [line items]    
Decrease [3]   (13)
Brent Price Measurement Input [member] | Oil And Gas Properties [member] | Wheatstone [member]    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets oil and gas properties [line items]    
Increase [3]   438
Decrease [3]   (438)
Brent Price Measurement Input [member] | Oil And Gas Properties [member] | NWS Oil Okha [member]    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets oil and gas properties [line items]    
Increase [3]   39
Decrease [3]   (39)
FX Measurement Input [member] | Oil And Gas Properties [member] | Wheatstone [member]    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets oil and gas properties [line items]    
Increase [3],[4]   (122)
Decrease [3]   122
FX Measurement Input [member] | Oil And Gas Properties [member] | NWS Oil Okha [member]    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets oil and gas properties [line items]    
Increase [3],[4]   (28)
Decrease [3]   $ 28
[1] A change of 1% represents 100 basis points.
[2] The relationship between the discount rate and carrying amount is non-linear and as such, the sensitivities are unlikely to result in a symmetrical impact. Due to the non-linear relationship, the impact of changing the discount rate is likely to be greater at a lower discount rate than at a higher discount rate.
[3] The sensitivities represent reasonable possible changes to the discount rate, oil price and FX assumptions.
[4] FX sensitivity of +12%/-12% was determined based on historical 5-year standard deviation of AU$/US$.