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Segment Production And Growth Assets - Summary of Segment Production and Growth Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of operating segments [line items]    
Total oil and gas properties [1] $ 39,919 $ 18,649
Australia [member]    
Disclosure of operating segments [line items]    
Total exploration and evaluation 529 546 [2]
Total oil and gas properties 25,155 16,226 [2]
Total lease assets 307 209 [2]
Additions to exploration and evaluation 19 [3] 458 [2]
Additions to oil and gas properties 2,021 [3] 1,135 [2]
Additions to lease assets [3] 143  
Australia [member] | Land and buildings [member]    
Disclosure of operating segments [line items]    
Total oil and gas properties 802 738 [2]
Total lease assets 93 76 [2]
Additions to lease assets [3] 4  
Australia [member] | Transferred exploration and evaluation [member]    
Disclosure of operating segments [line items]    
Total oil and gas properties 481 526 [2]
Australia [member] | Plant and equipment [member]    
Disclosure of operating segments [line items]    
Total oil and gas properties 18,249 12,316 [2]
Total lease assets 214 133 [2]
Additions to lease assets [3] 139  
Australia [member] | Projects in development [member]    
Disclosure of operating segments [line items]    
Total oil and gas properties 5,623 [4] 2,646 [2]
Australia [member] | Exploration [member]    
Disclosure of operating segments [line items]    
Additions to exploration and evaluation 1 [3] 1 [2]
Australia [member] | Evaluation [member]    
Disclosure of operating segments [line items]    
Additions to exploration and evaluation 19 [3] 451 [2]
Australia [member] | Restoration [member]    
Disclosure of operating segments [line items]    
Additions to exploration and evaluation (1) [3],[5] 6 [2]
Additions to oil and gas properties (346) [3] 18 [2]
Australia [member] | Oil And Gas Properties [member]    
Disclosure of operating segments [line items]    
Additions to oil and gas properties 2,252 [3] 1,071 [2]
Australia [member] | Capitalised borrowings costs [member]    
Disclosure of operating segments [line items]    
Additions to oil and gas properties 115 [3],[6] 46 [2],[7]
Australia [member] | Asia Pacific [member]    
Disclosure of operating segments [line items]    
Total exploration and evaluation 529 546 [2]
International [member]    
Disclosure of operating segments [line items]    
Total exploration and evaluation 278 68 [2]
Total oil and gas properties 14,479 2,198 [2]
Total lease assets 238 187 [2]
Additions to exploration and evaluation 221 [3] 43 [2]
Additions to oil and gas properties 1,711 [3] 1,142 [2]
Additions to lease assets 90 [3] 228 [2]
International [member] | Land and buildings [member]    
Disclosure of operating segments [line items]    
Total oil and gas properties 37  
Total lease assets 107 11 [2]
Additions to lease assets [2]   14
International [member] | Plant and equipment [member]    
Disclosure of operating segments [line items]    
Total oil and gas properties 4,647 3 [2]
Total lease assets 131 176 [2]
Additions to lease assets 90 [3] 214 [2]
International [member] | Projects in development [member]    
Disclosure of operating segments [line items]    
Total oil and gas properties 9,795 [4] 2,195 [2]
International [member] | Exploration [member]    
Disclosure of operating segments [line items]    
Additions to exploration and evaluation 121 [3] 41 [2]
International [member] | Evaluation [member]    
Disclosure of operating segments [line items]    
Additions to exploration and evaluation 100 [3] 2 [2]
International [member] | Restoration [member]    
Disclosure of operating segments [line items]    
Additions to oil and gas properties (28) [3] 14 [2]
International [member] | Oil And Gas Properties [member]    
Disclosure of operating segments [line items]    
Additions to oil and gas properties 1,560 [3] 1,051 [2]
International [member] | Capitalised borrowings costs [member]    
Disclosure of operating segments [line items]    
Additions to oil and gas properties 179 [3],[6] 77 [2],[7]
International [member] | Americas [member]    
Disclosure of operating segments [line items]    
Total exploration and evaluation 240  
International [member] | Africa [member]    
Disclosure of operating segments [line items]    
Total exploration and evaluation 38 68 [2]
Marketing [member]    
Disclosure of operating segments [line items]    
Total lease assets [2]   1
Marketing [member] | Land and buildings [member]    
Disclosure of operating segments [line items]    
Total lease assets [2]   1
Corporate/Other [member]    
Disclosure of operating segments [line items]    
Total oil and gas properties 285 225 [2]
Total lease assets 719 683 [2]
Additions to oil and gas properties 92 [3] 57 [2]
Additions to lease assets [3] 9  
Corporate/Other [member] | Land and buildings [member]    
Disclosure of operating segments [line items]    
Total oil and gas properties 1 1 [2]
Total lease assets 264 289 [2]
Corporate/Other [member] | Plant and equipment [member]    
Disclosure of operating segments [line items]    
Total oil and gas properties 161 146 [2]
Total lease assets 455 394 [2]
Additions to lease assets [3] 9  
Corporate/Other [member] | Projects in development [member]    
Disclosure of operating segments [line items]    
Total oil and gas properties 123 [4] 78 [2]
Corporate/Other [member] | Oil And Gas Properties [member]    
Disclosure of operating segments [line items]    
Additions to oil and gas properties 92 [3] 57 [2]
Consolidated [member]    
Disclosure of operating segments [line items]    
Total exploration and evaluation 807 614
Total oil and gas properties 39,919 18,649
Total lease assets 1,264 1,080
Additions to exploration and evaluation 240 [3] 501
Additions to oil and gas properties 3,824 [3] 2,334
Additions to lease assets 242 [3] 228
Consolidated [member] | Land and buildings [member]    
Disclosure of operating segments [line items]    
Total oil and gas properties 840 739
Total lease assets 464 377
Additions to lease assets 4 [3] 14
Consolidated [member] | Transferred exploration and evaluation [member]    
Disclosure of operating segments [line items]    
Total oil and gas properties 481 526
Consolidated [member] | Plant and equipment [member]    
Disclosure of operating segments [line items]    
Total oil and gas properties 23,057 12,465
Total lease assets 800 703
Additions to lease assets 238 [3] 214
Consolidated [member] | Projects in development [member]    
Disclosure of operating segments [line items]    
Total oil and gas properties 15,541 [4] 4,919
Consolidated [member] | Exploration [member]    
Disclosure of operating segments [line items]    
Additions to exploration and evaluation 122 [3] 42
Consolidated [member] | Evaluation [member]    
Disclosure of operating segments [line items]    
Additions to exploration and evaluation 119 [3] 453
Consolidated [member] | Restoration [member]    
Disclosure of operating segments [line items]    
Additions to exploration and evaluation (1) [3],[5] 6
Additions to oil and gas properties (374) [3] 32
Consolidated [member] | Oil And Gas Properties [member]    
Disclosure of operating segments [line items]    
Additions to oil and gas properties 3,904 [3] 2,179
Consolidated [member] | Capitalised borrowings costs [member]    
Disclosure of operating segments [line items]    
Additions to oil and gas properties 294 [3],[6] 123 [7]
Consolidated [member] | Asia Pacific [member]    
Disclosure of operating segments [line items]    
Total exploration and evaluation 529 546
Consolidated [member] | Americas [member]    
Disclosure of operating segments [line items]    
Total exploration and evaluation 240  
Consolidated [member] | Africa [member]    
Disclosure of operating segments [line items]    
Total exploration and evaluation $ 38 $ 68
[1] Oil and gas properties includes other plant and equipment which is no longer separately presented in the consolidated statement of financial position. The 2021 amounts have been reclassified to be presented on the same basis.
[2] The 2021 amounts have been restated to reflect the changes in operating segments. Refer to ‘Operating segment information’ in Note A.1 for details. In addition, oil and gas properties includes other plant and equipment which is no longer separately presented in the consolidated statement of financial position. The 2021 amounts have been reclassified to be presented on the same basis.
[3] Additions exclude acquisitions through business combinations.
[4] Projects in development include the fair value ascribed to future phases of certain projects acquired through business combinations.
[5] Relates to changes in restoration provision assumptions.
[6] Borrowing costs capitalised were at a weighted average interest rate of 3.8%.
[7] Borrowing costs capitalised were at a weighted average interest rate of 3.6%.