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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$/US$.

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- Definition The amount of increase (decrease) in the fair value measurement of assets due to a reasonably possible decrease in an unobservable input. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2022-03-24 -Paragraph 93 -Subparagraph h -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2022-en-r&anchor=para_93_h_ii&doctype=Standard -URIDate 2022-03-24 + Details
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