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Segment Revenue and Expenses - Summary of Earnings (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of operating segments [line items]      
Operating revenue $ 16,817 $ 6,962 $ 3,600
Cost of sales 6,540 3,845 2,985
Gross profit/(loss) 10,277 3,117 615
Other income 735 139 (36)
Depreciation of lease assets (308) (151)  
Impairment losses   10 5,269
Impairment reversals 900 1,058  
Profit/(loss) before tax and net finance costs 9,186 3,493 (5,171)
Oil And Gas Properties [member]      
Disclosure of operating segments [line items]      
Impairment reversals 900 1,058  
Land and buildings [member] | Oil And Gas Properties [member]      
Disclosure of operating segments [line items]      
Impairment reversals 87 44  
Operating segments [member]      
Disclosure of operating segments [line items]      
Other revenue 202 184 149
Operating revenue 16,817 6,962 3,600
Insurance (43) (31) (31)
Cost of sales (6,540) (3,845) (2,985)
Gross profit/(loss) 10,277 3,117 615
Other income 735 139 (36)
Exploration and evaluation expenditure (296) (54) (67)
Amortisation of permit acquisition (10) (3) (12)
Write-offs (164) (265) (2)
Exploration and evaluation (470) (322) (81)
General, administrative and other costs (791) (158) (190)
Depreciation of lease assets (140) (108) (94)
Restoration movement (272) (68) (28)
Other (1,053) (125) (59)
Other costs (2,256) (489) (400)
Other expenses (2,726) (811) (481)
Impairment losses   (10) (5,269)
Impairment reversals 900 1,058  
Profit/(loss) before tax and net finance costs 9,186 3,493 (5,171)
Depreciation of other plant and equipment   (30) (29)
Operating segments [member] | Oil And Gas Properties [member]      
Disclosure of operating segments [line items]      
Depreciation and amortisation (2,798) (1,549) (1,689)
Operating segments [member] | Land and buildings [member]      
Disclosure of operating segments [line items]      
Depreciation and amortisation (54) (51) (55)
Operating segments [member] | Transferred exploration and evaluation [member]      
Disclosure of operating segments [line items]      
Depreciation and amortisation (107) (79) (99)
Operating segments [member] | Plant and equipment [member]      
Disclosure of operating segments [line items]      
Depreciation and amortisation (2,637) (1,419) (1,535)
Operating segments [member] | Australia [member]      
Disclosure of operating segments [line items]      
Other revenue (280) (89) 99
Operating revenue 12,299 5,240 3,421
Insurance (35) (32) (32)
Cost of sales (4,181) (2,488) (2,475)
Gross profit/(loss) 8,118 2,752 946
Other income 722 97 3
Exploration and evaluation expenditure (20) (16) (26)
Amortisation of permit acquisition (1)   (6)
Exploration and evaluation (21) (16) (32)
General, administrative and other costs (13) (5) (7)
Depreciation of lease assets (49) (28) (26)
Restoration movement (234) (80) (65)
Other (8) (57) (8)
Other costs (304) (170) (106)
Other expenses (325) (186) (138)
Impairment losses   (10) (3,971)
Impairment reversals 900 1,058  
Profit/(loss) before tax and net finance costs 9,415 3,711 (3,160)
Depreciation of other plant and equipment   0  
Operating segments [member] | Australia [member] | External Customers [member]      
Disclosure of operating segments [line items]      
Operating revenue (455) (236) (47)
Operating segments [member] | Australia [member] | Oil And Gas Properties [member]      
Disclosure of operating segments [line items]      
Depreciation and amortisation (2,326) (1,549) (1,689)
Operating segments [member] | Australia [member] | Land and buildings [member]      
Disclosure of operating segments [line items]      
Depreciation and amortisation (51) (51) (55)
Operating segments [member] | Australia [member] | Transferred exploration and evaluation [member]      
Disclosure of operating segments [line items]      
Depreciation and amortisation (107) (79) (99)
Operating segments [member] | Australia [member] | Plant and equipment [member]      
Disclosure of operating segments [line items]      
Depreciation and amortisation (2,168) (1,419) (1,535)
Operating segments [member] | International [member]      
Disclosure of operating segments [line items]      
Other revenue (5)    
Operating revenue 1,570    
Insurance (7)    
Cost of sales (837)    
Gross profit/(loss) 733    
Other income 4 (2) (1)
Exploration and evaluation expenditure (277) (27) (32)
Amortisation of permit acquisition (9) (2) (5)
Write-offs (164) (265) (2)
Exploration and evaluation (450) (294) (39)
General, administrative and other costs (21) (1) (14)
Depreciation of lease assets (11)    
Restoration movement (46) 12 37
Other (84) (32)  
Other costs (162) (21) 23
Other expenses (612) (315) (16)
Impairment losses     (1,298)
Profit/(loss) before tax and net finance costs 125 (317) (1,315)
Depreciation of other plant and equipment   0  
Operating segments [member] | International [member] | External Customers [member]      
Disclosure of operating segments [line items]      
Operating revenue (5)    
Operating segments [member] | International [member] | Oil And Gas Properties [member]      
Disclosure of operating segments [line items]      
Depreciation and amortisation (439)    
Operating segments [member] | International [member] | Land and buildings [member]      
Disclosure of operating segments [line items]      
Depreciation and amortisation (3)    
Operating segments [member] | International [member] | Transferred exploration and evaluation [member]      
Disclosure of operating segments [line items]      
Depreciation and amortisation 0    
Operating segments [member] | International [member] | Plant and equipment [member]      
Disclosure of operating segments [line items]      
Depreciation and amortisation (436)    
Operating segments [member] | Marketing [member]      
Disclosure of operating segments [line items]      
Other revenue 487 273 50
Operating revenue 2,948 1,722 179
Cost of sales (1,620) (1,397) (557)
Gross profit/(loss) 1,328 325 (378)
Other income 5 1 1
General, administrative and other costs (10)    
Other (475) 28  
Other costs (485) 28  
Other expenses (485) 28  
Profit/(loss) before tax and net finance costs 848 354 (377)
Depreciation of other plant and equipment   0 0
Operating segments [member] | Marketing [member] | External Customers [member]      
Disclosure of operating segments [line items]      
Operating revenue 460 236 47
Operating segments [member] | Corporate/Other [member]      
Disclosure of operating segments [line items]      
Insurance (1) 1 1
Cost of sales 98 40 47
Gross profit/(loss) 98 40 47
Other income 4 43 (39)
Exploration and evaluation expenditure 1 (11) (9)
Amortisation of permit acquisition   (1) (1)
Write-offs     0
Exploration and evaluation 1 (12) (10)
General, administrative and other costs (747) (152) (169)
Depreciation of lease assets (80) (80) (68)
Restoration movement 8    
Other (486) (64) (51)
Other costs (1,305) (326) (317)
Other expenses (1,304) (338) (327)
Profit/(loss) before tax and net finance costs (1,202) (255) (319)
Depreciation of other plant and equipment   (30) (29)
Operating segments [member] | Corporate/Other [member] | Oil And Gas Properties [member]      
Disclosure of operating segments [line items]      
Depreciation and amortisation (33) 0  
Operating segments [member] | Corporate/Other [member] | Plant and equipment [member]      
Disclosure of operating segments [line items]      
Depreciation and amortisation (33) 0  
Liquefied natural gas [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 11,289 5,359 2,519
Liquefied natural gas [member] | Operating segments [member] | Australia [member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 8,855 3,910 2,390
Liquefied natural gas [member] | Operating segments [member] | Marketing [member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 2,434 1,449 129
Pipeline gas [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 1,362 43 73
Pipeline gas [member] | Operating segments [member] | Australia [member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 1,086 43 73
Pipeline gas [member] | Operating segments [member] | International [member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 276    
Crude oil and condensate [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 3,758 1,316 843
Crude oil and condensate [member] | Operating segments [member] | Australia [member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 2,467 1,316 843
Crude oil and condensate [member] | Operating segments [member] | International [member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 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 18    
Natural gas liquids [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 206 60 16
Natural gas liquids [member] | Operating segments [member] | Australia [member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 171 60 16
Natural gas liquids [member] | Operating segments [member] | International [member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 26    
Natural gas liquids [member] | Operating segments [member] | Marketing [member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 9    
Revenue from sale of hydrocarbons [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 16,615 6,778 3,451
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 12,579 5,329 3,322
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 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 2,461 1,449 129
Processing and services revenue [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Other revenue 175 143 142
Processing and services revenue [member] | Operating segments [member] | Australia [member]      
Disclosure of operating segments [line items]      
Other revenue 175 143 142
Shipping and other revenue [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Other revenue 27 41 7
Shipping and other revenue [member] | Operating segments [member] | Australia [member]      
Disclosure of operating segments [line items]      
Other revenue   4 4
Shipping and other revenue [member] | Operating segments [member] | Marketing [member]      
Disclosure of operating segments [line items]      
Other revenue 27 37 3
Production costs [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Cost of sales (1,281) (481) (478)
Production costs [member] | Operating segments [member] | Australia [member]      
Disclosure of operating segments [line items]      
Cost of sales (975) (489) (486)
Production costs [member] | Operating segments [member] | International [member]      
Disclosure of operating segments [line items]      
Cost of sales (313)    
Production costs [member] | Operating segments [member] | Corporate/Other [member]      
Disclosure of operating segments [line items]      
Cost of sales 7 8 8
Royalties excise and levies [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Cost of sales (596) (218) (82)
Royalties excise and levies [member] | Operating segments [member] | Australia [member]      
Disclosure of operating segments [line items]      
Cost of sales (540) (218) (82)
Royalties excise and levies [member] | Operating segments [member] | International [member]      
Disclosure of operating segments [line items]      
Cost of sales (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 41 17 (32)
Inventory movement [member] | Operating segments [member] | Australia [member]      
Disclosure of operating segments [line items]      
Cost of sales 44 17 (32)
Inventory movement [member] | Operating segments [member] | International [member]      
Disclosure of operating segments [line items]      
Cost of sales (3)    
Costs of production [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Cost of sales (1,879) (713) (623)
Costs of production [member] | Operating segments [member] | Australia [member]      
Disclosure of operating segments [line items]      
Cost of sales (1,506) (722) (632)
Costs of production [member] | Operating segments [member] | International [member]      
Disclosure of operating segments [line items]      
Cost of sales (362)    
Costs of production [member] | Operating segments [member] | Corporate/Other [member]      
Disclosure of operating segments [line items]      
Cost of sales (11) 9 9
Shipping and direct sales costs [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Cost of sales (279) (210) (111)
Shipping and direct sales costs [member] | Operating segments [member] | Australia [member]      
Disclosure of operating segments [line items]      
Cost of sales (312) (197) (146)
Shipping and direct sales costs [member] | Operating segments [member] | International [member]      
Disclosure of operating segments [line items]      
Cost of sales (36)    
Shipping and direct sales costs [member] | Operating segments [member] | Marketing [member]      
Disclosure of operating segments [line items]      
Cost of sales (73) (45) (3)
Shipping and direct sales costs [member] | Operating segments [member] | Corporate/Other [member]      
Disclosure of operating segments [line items]      
Cost of sales 142 32 38
Trading costs [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Cost of sales (1,777) (1,495) (211)
Trading costs [member] | Operating segments [member] | Australia [member]      
Disclosure of operating segments [line items]      
Cost of sales (14) (3) (4)
Trading costs [member] | Operating segments [member] | Marketing [member]      
Disclosure of operating segments [line items]      
Cost of sales (1,763) (1,492) (207)
Other hydrocarbon costs [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Cost of sales (19) (6) (4)
Other hydrocarbon costs [member] | Operating segments [member] | Australia [member]      
Disclosure of operating segments [line items]      
Cost of sales (19) (6) (4)
Other cost of sales [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Cost of sales (4) (12)  
Other cost of sales [member] | Operating segments [member] | Australia [member]      
Disclosure of operating segments [line items]      
Cost of sales (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 (347)
Movement in onerous contract provision [member] | Operating segments [member] | Marketing [member]      
Disclosure of operating segments [line items]      
Cost of sales 216 140 (347)
Total other cost of sales [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Cost of sales (1,863) (1,583) (673)
Total other cost of sales [member] | Operating segments [member] | Australia [member]      
Disclosure of operating segments [line items]      
Cost of sales (349) (217) (154)
Total other cost of sales [member] | Operating segments [member] | International [member]      
Disclosure of operating segments [line items]      
Cost of sales (36)    
Total other cost of sales [member] | Operating segments [member] | Marketing [member]      
Disclosure of operating segments [line items]      
Cost of sales (1,620) (1,397) (557)
Total other cost of sales [member] | Operating segments [member] | Corporate/Other [member]      
Disclosure of operating segments [line items]      
Cost of sales $ 142 $ 31 $ 38