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Impairment Of Exploration And Evaluation And Oil And Gas Properties - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) us-au t | Dec. 31, 2021 USD ($) us-au t | Dec. 31, 2020 USD ($)
Impairment of exploration and evaluation and oil and gas properties [line items] |  |  |
Goodwill | $ 4,614 |  |
Australian carbon price per tonne of emissions | t | 80 | 80 |
Inflation rate | 2.00% | 2.00% |
Foreign exchange rate is based on management view of long term exchnage rates | us-au | 0.75 | 0.75 |
Impairment loss |  | $ 10 | $ 5,269
WDS International Segment [Member] | Other [Member] |  |  |
Impairment of exploration and evaluation and oil and gas properties [line items] |  |  |
Goodwill | $ 283 |  |
Oil And Gs Properties [Member] | Valuation Of Recoverable Amount Of Cash Generating Unit [Member] | Volume Of Production Of Brent Oil [Member] |  |  |
Impairment of exploration and evaluation and oil and gas properties [line items] |  |  |
Percentage of reasonably possible increase in unobservable input assets | 4.00% |  |
Percentage of reasonably possible decrease in unobservable input assets | 4.00% |  |
Oil And Gs Properties [Member] | Valuation Of Recoverable Amount Of Cash Generating Unit [Member] | FX Measurement Input [Member] |  |  |
Impairment of exploration and evaluation and oil and gas properties [line items] |  |  |
Percentage of reasonably possible increase in unobservable input assets | 12.00% |  |
Percentage of reasonably possible decrease in unobservable input assets | 12.00% |  |
Oil And Gs Properties [Member] | Valuation Of Recoverable Amount Of Cash Generating Unit [Member] | Brent Price Measurement Input [Member] |  |  |
Impairment of exploration and evaluation and oil and gas properties [line items] |  |  |
Percentage of reasonably possible increase in unobservable input assets | 10.00% |  |
Percentage of reasonably possible decrease in unobservable input assets | 10.00% |  |
Oil And Gs Properties [Member] | Valuation Of Recoverable Amount Of Cash Generating Unit [Member] | Discount rate, measurement input [member] |  |  |
Impairment of exploration and evaluation and oil and gas properties [line items] |  |  |
Percentage of reasonably possible increase in unobservable input assets | 1.50% |  |
Percentage of reasonably possible decrease in unobservable input assets | 1.50% |  |
Non-current assets held for sale [member] | Australian Operating Segment [member] |  |  |
Impairment of exploration and evaluation and oil and gas properties [line items] |  |  |
Impairment loss |  | 10 |
Non-current assets held for sale [member] | Level 3 of fair value hierarchy [member] |  |  |
Impairment of exploration and evaluation and oil and gas properties [line items] |  |  |
Impairment loss |  | $ 10 |
Bottom of range [member] |  |  |
Impairment of exploration and evaluation and oil and gas properties [line items] |  |  |
Pre tax discount rate |  | 8.90% |
Post tax discount rate | 8.00% | 7.50% |
Top of range [member] |  |  |
Impairment of exploration and evaluation and oil and gas properties [line items] |  |  |
Pre tax discount rate |  | 11.60% |
Post tax discount rate | 11.50% | 8.50% |

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