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Additional Information - Summary of Standardised Measure of Discounted Future Cash Flows (Detail) - Exploration and evaluation assets [member] - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Standardised Measure Of Discounted Future Cash Flows [Line Items] |  |  |  |
Future cash inflows | $ 235,450 | $ 81,897 | $ 14,629 |
Future production costs | (40,855) | (23,092) | (3,862) |
Future development costs | (16,746) | (10,777) | (3,800) |
Future income taxes | (67,005) | (16,356) | (1,023) |
Future net cash flows | 110,844 | 31,672 | 5,944 |
Discount at 10% per annum | (56,701) | (15,935) | (860) |
Standardised measure | 54,143 | 15,737 | 5,084 | $ 10,324
Australia [member] |  |  |  |
Standardised Measure Of Discounted Future Cash Flows [Line Items] |  |  |  |
Future cash inflows | 197,194 | 76,202 | 14,629 |
Future production costs | (31,157) | (22,193) | (3,862) |
Future development costs | (12,259) | (8,296) | (3,800) |
Future income taxes | (62,182) | (16,266) | (1,023) |
Future net cash flows | 91,596 | 29,447 | 5,944 |
Discount at 10% per annum | (48,924) | (14,793) | (860) |
Standardised measure | 42,672 | 14,654 | $ 5,084 |
International [member] |  |  |  |
Standardised Measure Of Discounted Future Cash Flows [Line Items] |  |  |  |
Future cash inflows | 38,256 | 5,695 |  |
Future production costs | (9,698) | (899) |  |
Future development costs | (4,487) | (2,481) |  |
Future income taxes | (4,823) | (90) |  |
Future net cash flows | 19,248 | 2,225 |  |
Discount at 10% per annum | (7,777) | (1,142) |  |
Standardised measure | $ 11,471 | $ 1,083 |  |

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- Definition Amount of estimated future accumulated cash inflow from the sale 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 estimated future accumulated cash outflow for costs to be incurred in developing 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 estimated future accumulated cash outflow for income tax, based on the future income less future expense derived from production and sale 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, after future accumulated cash outflow for development and production costs and future income tax, of estimated future accumulated cash inflow from the sale 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 estimated future accumulated cash outflow for costs to be incurred in producing 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 discount on future accumulated cash inflow, after deducting future accumulated cash outflow for development and production costs and future income tax, from sale of proved oil and gas reserves, using a discount rate of 10 percent a year. + 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 discounted future accumulated cash inflow relating 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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