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Segment Revenue and Expenses - Summary of Earnings (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of operating segments [line items]        
Impairment losses   $ (1,917)   $ (10)
Impairment reversals     $ 900 1,058
Profit/(loss) before tax and net finance costs   3,307 9,186 3,493
Operating revenue   13,994 16,817 6,962
Gross profit/(loss)   6,475 10,277 3,117
Other income   322 735 139
Depreciation of lease assets   (350) (308)  
Oil and gas properties [member]        
Disclosure of operating segments [line items]        
Impairment losses $ (68)      
Impairment reversals     900  
Land and buildings [member] | Oil and gas properties [member]        
Disclosure of operating segments [line items]        
Impairment losses $ 0      
Impairment reversals     87  
Operating segments [member]        
Disclosure of operating segments [line items]        
Impairment losses   (1,917)   (10)
Impairment reversals     900 1,058
Profit/(loss) before tax and net finance costs   3,307 9,186 3,493
Other revenue   193 202 184
Operating revenue   13,994 16,817 6,962
Cost of sales   (7,519) (6,540) (3,845)
Insurance   (60) (43) (31)
Gross profit/(loss)   6,475 10,277 3,117
Other income   322 735 139
Exploration and evaluation expenditure   (279) (296) (54)
Amortisation of permit acquisition   (4) (10) (3)
Write-offs   (77) (164) (265)
Exploration and evaluation   (360) (470) (322)
General, administrative and other costs   (453) (791) (158)
Depreciation of other plant and equipment       (30)
Depreciation of lease assets   (179) (140) (108)
Restoration movement   (147) (272) (68)
Other   (434) (1,053) (125)
Other costs   (1,213) (2,256) (489)
Other expenses   (1,573) (2,726) (811)
Operating segments [member] | Oil and gas properties [member]        
Disclosure of operating segments [line items]        
Depreciation and amortisation   (3,956) (2,798) (1,549)
Operating segments [member] | Land and buildings [member]        
Disclosure of operating segments [line items]        
Depreciation and amortisation   (67) (54) (51)
Operating segments [member] | Transferred exploration and evaluation [member]        
Disclosure of operating segments [line items]        
Depreciation and amortisation   (125) (107) (79)
Operating segments [member] | Plant and equipment [member]        
Disclosure of operating segments [line items]        
Depreciation and amortisation   (3,764) (2,637) (1,419)
Operating segments [member] | Australia [member]        
Disclosure of operating segments [line items]        
Impairment losses   (534)   (10)
Impairment reversals     900 1,058
Profit/(loss) before tax and net finance costs   4,487 9,415 3,711
Other revenue   18 (280) (89)
Operating revenue   9,802 12,299 5,240
Cost of sales   (4,660) (4,181) (2,488)
Insurance   (41) (35) (32)
Gross profit/(loss)   5,142 8,118 2,752
Other income   160 722 97
Exploration and evaluation expenditure   (24) (20) (16)
Amortisation of permit acquisition     (1)  
Write-offs   (31)    
Exploration and evaluation   (55) (21) (16)
General, administrative and other costs     (13) (5)
Depreciation of lease assets   (50) (49) (28)
Restoration movement   (125) (234) (80)
Other   (51) (8) (57)
Other costs   (226) (304) (170)
Other expenses   (281) (325) (186)
Operating segments [member] | Australia [member] | External Customers [member]        
Disclosure of operating segments [line items]        
Operating revenue   (166) (455) (236)
Operating segments [member] | Australia [member] | Oil and gas properties [member]        
Disclosure of operating segments [line items]        
Depreciation and amortisation   (2,754) (2,326) (1,549)
Operating segments [member] | Australia [member] | Land and buildings [member]        
Disclosure of operating segments [line items]        
Depreciation and amortisation   (62) (51) (51)
Operating segments [member] | Australia [member] | Transferred exploration and evaluation [member]        
Disclosure of operating segments [line items]        
Depreciation and amortisation   (101) (107) (79)
Operating segments [member] | Australia [member] | Plant and equipment [member]        
Disclosure of operating segments [line items]        
Depreciation and amortisation   (2,591) (2,168) (1,419)
Operating segments [member] | International [member]        
Disclosure of operating segments [line items]        
Impairment losses   (1,383)    
Profit/(loss) before tax and net finance costs   (808) 125 (317)
Other revenue   (15) (5)  
Operating revenue   2,549 1,570  
Cost of sales   (1,689) (837)  
Insurance   (11) (7)  
Gross profit/(loss)   860 733  
Other income   54 4 (2)
Exploration and evaluation expenditure   (253) (277) (27)
Amortisation of permit acquisition   (4) (9) (2)
Write-offs   (46) (164) (265)
Exploration and evaluation   (303) (450) (294)
General, administrative and other costs     (21) (1)
Depreciation of lease assets   (14) (11)  
Restoration movement   (22) (46) 12
Other     (84) (32)
Other costs   (36) (162) (21)
Other expenses   (339) (612) (315)
Operating segments [member] | International [member] | External Customers [member]        
Disclosure of operating segments [line items]        
Operating revenue   (15) (5)  
Operating segments [member] | International [member] | Oil and gas properties [member]        
Disclosure of operating segments [line items]        
Depreciation and amortisation   (1,168) (439)  
Operating segments [member] | International [member] | Land and buildings [member]        
Disclosure of operating segments [line items]        
Depreciation and amortisation   (5) (3)  
Operating segments [member] | International [member] | Transferred exploration and evaluation [member]        
Disclosure of operating segments [line items]        
Depreciation and amortisation   (24) 0  
Operating segments [member] | International [member] | Plant and equipment [member]        
Disclosure of operating segments [line items]        
Depreciation and amortisation   (1,139) (436)  
Operating segments [member] | Marketing [member]        
Disclosure of operating segments [line items]        
Impairment losses   0    
Profit/(loss) before tax and net finance costs   375 848 354
Other revenue   190 487 273
Operating revenue   1,643 2,948 1,722
Cost of sales   (1,110) (1,620) (1,397)
Gross profit/(loss)   533 1,328 325
Other income   26 5 1
General, administrative and other costs     (10)  
Depreciation of lease assets   (75)    
Other   (109) (475)  
Other       28
Other costs   (184) (485) 28
Other expenses   (184) (485) 28
Operating segments [member] | Marketing [member] | External Customers [member]        
Disclosure of operating segments [line items]        
Operating revenue   181 460 236
Operating segments [member] | Corporate/Other [member]        
Disclosure of operating segments [line items]        
Impairment losses   0    
Profit/(loss) before tax and net finance costs   (747) (1,202) (255)
Cost of sales   (60) 98 40
Insurance   (8) (1) 1
Gross profit/(loss)   (60) 98 40
Other income   82 4 43
Exploration and evaluation expenditure   (2) 1 (11)
Amortisation of permit acquisition       (1)
Exploration and evaluation   (2) 1 (12)
General, administrative and other costs   (453) (747) (152)
Depreciation of other plant and equipment       (30)
Depreciation of lease assets   (40) (80) (80)
Restoration movement     8  
Other   (274) (486) (64)
Other costs   (767) (1,305) (326)
Other expenses   (769) (1,304) (338)
Operating segments [member] | Corporate/Other [member] | Oil and gas properties [member]        
Disclosure of operating segments [line items]        
Depreciation and amortisation   (34) (33) 0
Operating segments [member] | Corporate/Other [member] | Plant and equipment [member]        
Disclosure of operating segments [line items]        
Depreciation and amortisation   (34) (33) 0
Liquefied natural gas [member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Revenue from sale of oil and gas products   8,165 11,289 5,359
Liquefied natural gas [member] | Operating segments [member] | Australia [member]        
Disclosure of operating segments [line items]        
Revenue from sale of oil and gas products   6,867 8,855 3,910
Liquefied natural gas [member] | Operating segments [member] | Marketing [member]        
Disclosure of operating segments [line items]        
Revenue from sale of oil and gas products   1,298 2,434 1,449
Pipeline gas [member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Revenue from sale of oil and gas products   1,374 1,362 43
Pipeline gas [member] | Operating segments [member] | Australia [member]        
Disclosure of operating segments [line items]        
Revenue from sale of oil and gas products   1,088 1,086 43
Pipeline gas [member] | Operating segments [member] | International [member]        
Disclosure of operating segments [line items]        
Revenue from sale of oil and gas products   286 276  
Crude oil and condensate [member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Revenue from sale of oil and gas products   3,981 3,758 1,316
Crude oil and condensate [member] | Operating segments [member] | Australia [member]        
Disclosure of operating segments [line items]        
Revenue from sale of oil and gas products   1,611 2,467 1,316
Crude oil and condensate [member] | Operating segments [member] | International [member]        
Disclosure of operating segments [line items]        
Revenue from sale of oil and gas products   2,246 1,273  
Crude oil and condensate [member] | Operating segments [member] | Marketing [member]        
Disclosure of operating segments [line items]        
Revenue from sale of oil and gas products   124 18  
Natural gas liquids [member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Revenue from sale of oil and gas products   281 206 60
Natural gas liquids [member] | Operating segments [member] | Australia [member]        
Disclosure of operating segments [line items]        
Revenue from sale of oil and gas products   218 171 60
Natural gas liquids [member] | Operating segments [member] | International [member]        
Disclosure of operating segments [line items]        
Revenue from sale of oil and gas products   32 26  
Natural gas liquids [member] | Operating segments [member] | Marketing [member]        
Disclosure of operating segments [line items]        
Revenue from sale of oil and gas products   31 9  
Revenue from sale of hydrocarbons [member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Revenue from sale of oil and gas products   13,801 16,615 6,778
Revenue from sale of hydrocarbons [member] | Operating segments [member] | Australia [member]        
Disclosure of operating segments [line items]        
Revenue from sale of oil and gas products   9,784 12,579 5,329
Revenue from sale of hydrocarbons [member] | Operating segments [member] | International [member]        
Disclosure of operating segments [line items]        
Revenue from sale of oil and gas products   2,564 1,575  
Revenue from sale of hydrocarbons [member] | Operating segments [member] | Marketing [member]        
Disclosure of operating segments [line items]        
Revenue from sale of oil and gas products   1,453 2,461 1,449
Processing and services revenue [member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Other revenue   184 175 143
Processing and services revenue [member] | Operating segments [member] | Australia [member]        
Disclosure of operating segments [line items]        
Other revenue   184 175 143
Shipping and other revenue [member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Other revenue   9 27 41
Shipping and other revenue [member] | Operating segments [member] | Australia [member]        
Disclosure of operating segments [line items]        
Other revenue       4
Shipping and other revenue [member] | Operating segments [member] | Marketing [member]        
Disclosure of operating segments [line items]        
Other revenue   9 27 37
Production costs [member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Cost of sales   (1,562) (1,281) (481)
Production costs [member] | Operating segments [member] | Australia [member]        
Disclosure of operating segments [line items]        
Cost of sales   (1,173) (975) (489)
Production costs [member] | Operating segments [member] | International [member]        
Disclosure of operating segments [line items]        
Cost of sales   (389) (313)  
Production costs [member] | Operating segments [member] | Corporate/Other [member]        
Disclosure of operating segments [line items]        
Cost of sales     7 8
Royalties excise and levies [member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Cost of sales   (503) (596) (218)
Royalties excise and levies [member] | Operating segments [member] | Australia [member]        
Disclosure of operating segments [line items]        
Cost of sales   (462) (540) (218)
Royalties excise and levies [member] | Operating segments [member] | International [member]        
Disclosure of operating segments [line items]        
Cost of sales   (41) (39)  
Royalties excise and levies [member] | Operating segments [member] | Corporate/Other [member]        
Disclosure of operating segments [line items]        
Cost of sales     (17)  
Inventory movement [member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Cost of sales   (37) 41 17
Inventory movement [member] | Operating segments [member] | Australia [member]        
Disclosure of operating segments [line items]        
Cost of sales   (40) 44 17
Inventory movement [member] | Operating segments [member] | International [member]        
Disclosure of operating segments [line items]        
Cost of sales   3 (3)  
Inventory movement [member] | Operating segments [member] | Corporate/Other [member]        
Disclosure of operating segments [line items]        
Cost of sales   0    
Costs of production [member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Cost of sales   (2,162) (1,879) (713)
Costs of production [member] | Operating segments [member] | Australia [member]        
Disclosure of operating segments [line items]        
Cost of sales   (1,716) (1,506) (722)
Costs of production [member] | Operating segments [member] | International [member]        
Disclosure of operating segments [line items]        
Cost of sales   (438) (362)  
Costs of production [member] | Operating segments [member] | Corporate/Other [member]        
Disclosure of operating segments [line items]        
Cost of sales   (8) (11) 9
Shipping and direct sales costs [member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Cost of sales   (319) (279) (210)
Shipping and direct sales costs [member] | Operating segments [member] | Australia [member]        
Disclosure of operating segments [line items]        
Cost of sales   (164) (312) (197)
Shipping and direct sales costs [member] | Operating segments [member] | International [member]        
Disclosure of operating segments [line items]        
Cost of sales   (83) (36)  
Shipping and direct sales costs [member] | Operating segments [member] | Marketing [member]        
Disclosure of operating segments [line items]        
Cost of sales   (54) (73) (45)
Shipping and direct sales costs [member] | Operating segments [member] | Corporate/Other [member]        
Disclosure of operating segments [line items]        
Cost of sales   (18) 142 32
Trading costs [member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Cost of sales   (1,068) (1,777) (1,495)
Trading costs [member] | Operating segments [member] | Australia [member]        
Disclosure of operating segments [line items]        
Cost of sales   (12) (14) (3)
Trading costs [member] | Operating segments [member] | Marketing [member]        
Disclosure of operating segments [line items]        
Cost of sales   (1,056) (1,763) (1,492)
Other hydrocarbon costs [member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Cost of sales   (7) (19) (6)
Other hydrocarbon costs [member] | Operating segments [member] | Australia [member]        
Disclosure of operating segments [line items]        
Cost of sales   (7) (19) (6)
Other cost of sales [member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Cost of sales   (7) (4) (12)
Other cost of sales [member] | Operating segments [member] | Australia [member]        
Disclosure of operating segments [line items]        
Cost of sales   (7) (4) (11)
Other cost of sales [member] | Operating segments [member] | Corporate/Other [member]        
Disclosure of operating segments [line items]        
Cost of sales       (1)
Movement in onerous contract provision [member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Cost of sales     216 140
Movement in onerous contract provision [member] | Operating segments [member] | Marketing [member]        
Disclosure of operating segments [line items]        
Cost of sales     216 140
Total other cost of sales [member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Cost of sales   (1,401) (1,863) (1,583)
Total other cost of sales [member] | Operating segments [member] | Australia [member]        
Disclosure of operating segments [line items]        
Cost of sales   (190) (349) (217)
Total other cost of sales [member] | Operating segments [member] | International [member]        
Disclosure of operating segments [line items]        
Cost of sales   (83) (36)  
Total other cost of sales [member] | Operating segments [member] | Marketing [member]        
Disclosure of operating segments [line items]        
Cost of sales   (1,110) (1,620) (1,397)
Total other cost of sales [member] | Operating segments [member] | Corporate/Other [member]        
Disclosure of operating segments [line items]        
Cost of sales   $ (18) $ 142 $ 31