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Additional Information - Summary of Movement in Changes in the Standardised Measure (Detail) - Exploration and evaluation assets [member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Detailed Information About Changes In Standardised Measure [Line Items] |  |  |
Standardised measure at the beginning of the year | $ 15,737 | $ 5,084 | $ 10,324
Prices, net of production costs | 22,558 | 7,741 | (5,800)
Changes in future development costs | (873) | 20 | (29)
Revisions of reserves quantity estimates | 5,898 | 2,109 | 269
Accretion of discount | 4,051 | 430 | 1,038
Changes in production timing and other | 2,371 | 3,485 | (1,180)
Sales of oil and gas, net of production costs | (10,202) | (5,698) | (2,666)
Acquisitions of reserves-in-place | 28,309 |  |
Sales of reserves-in-place | 0 |  |
Previously estimated development costs incurred | 3,339 | 565 | 702
Extensions, discoveries, and improved recoveries, net of future costs |  | 8,346 | 44
Changes in future income taxes | (17,045) | (6,345) | 2,382
Standardised measure at the end of the year | $ 54,143 | $ 15,737 | $ 5,084

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- Definition Amount of decrease in standardized measure of discounted future net cash flow as a result of sales of minerals in place. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 + Details
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- Definition Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of extensions, discoveries and improved recovery of proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 + Details
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- Definition Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of change in the estimated future income tax on future pretax net cash flows related to the entity's proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 + Details
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- Definition Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of revisions of estimated quantity of oil and gas in proved reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 + Details
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- Definition Amount of accretion of discount for the standardized measure of discounted future net cash flow related to proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 + Details
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