The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies.

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The discount rate used in the current measurement of fair value less costs of disposal.

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The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Total for all business combinations [member]]

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The percentage of a reasonably possible decrease in an unobservable input used in fair value measurement of assets.

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Australian carbon price per tonne of emissions.

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Impairment Of Exploration And Evaluation, Property, Plant And Equipment And Goodwill - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) t us-au	Dec. 31, 2023 USD ($) t us-au	Dec. 31, 2022 USD ($)
Impairment of exploration and evaluation and oil and gas properties [line items]
Goodwill	$ 3,866	$ 3,995
Australian carbon price per tonne of emissions \| t	80	80
Foreign exchange rate is based on management view of long term exchnage rates \| us-au	0.75	0.75
International Segment [Member] \| Other [Member]
Impairment of exploration and evaluation and oil and gas properties [line items]
Goodwill	$ 288	$ 288	$ 283
Property, plant and equipment [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%	4.00%
Percentage of reasonably possible decrease in unobservable input assets	4.00%	4.00%
Property, plant and equipment [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	10.00%	12.00%
Percentage of reasonably possible decrease in unobservable input assets	10.00%	12.00%
Property, plant and equipment [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%	10.00%
Percentage of reasonably possible decrease in unobservable input assets	10.00%	10.00%
Property, plant and equipment [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	1.00%	1.00%
Percentage of reasonably possible decrease in unobservable input assets	1.00%	1.00%
Bottom of range [member]
Impairment of exploration and evaluation and oil and gas properties [line items]
Post tax discount rate	8.50%	8.50%
Top of range [member]
Impairment of exploration and evaluation and oil and gas properties [line items]
Post tax discount rate	9.50%	10.50%
AU [member] \| Based on assets [member]
Impairment of exploration and evaluation and oil and gas properties [line items]
Inflation rate	2.30%	2.50%
US [member] \| Based on assets [member]
Impairment of exploration and evaluation and oil and gas properties [line items]
Inflation rate	2.00%	2.00%
O C I Clean Ammonia Holding B V [Member]
Impairment of exploration and evaluation and oil and gas properties [line items]
Goodwill recognised as of acquisition date	$ 169