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Segment Revenue and Expenses - Summary of Earnings (Parenthetical) (Detail) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jun. 01, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of operating segments [line items] |  |  |  |
Revenue from sale of liquified natural gas |  | $ 16,817 | $ 6,962 | $ 3,600
Impairment loss |  |  | 10 | 5,269
Gains (losses) on change in fair value of derivatives |  | 960 | 31 | 31
BHP Petroleum International Pty Ltd [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Acquisition related costs paid classified as operating activities | $ 419 | 357 |  |
Operating segments [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenue from contracts with customers |  | 16,790 | 6,923 |
Sub-lease income |  | 27 | 39 |
Movement in onerous contract provision, Changes in estimates |  | 245 | 95 | 54
Movement in onerous contract provision, Provision used |  | 29 | 45 | 41
Costs relating to exit from exploration licences |  | 142 |  |
Other trading income |  |  | 67 |
Net foreign exchange gain |  |  | 44 |
Costs of unsuccessful wells |  |  | 56 |
Capitalised costs written off |  |  | 209 |
Gain (loss) on hedge ineffectiveness |  |  | 91 |
Exit fee |  |  | 33 |
Revenue from sale of liquified natural gas |  | 16,817 | 6,962 | 3,600
Onerous contract provision |  |  |  | 447
Movement in onerous contract provision, Revision of discount rates |  |  |  | 5
Impairment loss |  |  | (10) | (5,269)
Revaluation gain on assets |  | 427 |  |
Variable consideraion |  | 71 |  |
Operating segments [member] | Exploration and evaluation assets [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Impairment loss |  |  |  | 1,557
Operating segments [member] | Oil and gas assets [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Impairment loss |  |  |  | 3,712
Operating segments [member] | Australia segment [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenue from sale of liquified natural gas |  | 12,299 | 5,240 | 3,421
Impairment loss |  |  | $ (10) | (3,971)
Operating segments [member] | Adjustment [member] | Australia segment [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenue from sale of liquified natural gas |  |  |  | $ 113
Corporates Or Others 2022 |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Costs of unsuccessful wells |  | $ 125 |  |

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