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Segment Revenue and Expenses - Summary of Earnings (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of operating segments [line items]      
Impairment losses   $ (1,917)  
Impairment reversals     $ 900
Profit/(loss) before tax and net finance costs $ 4,514 3,307 9,186
Operating revenue 13,179 13,994 16,817
Gross profit 5,678 6,475 10,277
Other income 624 322 735
Amortisation of intangible assets (40) (2)  
Depreciation of lease assets (300) (350)  
Operating segments [member]      
Disclosure of operating segments [line items]      
Impairment losses   (1,917)  
Impairment reversals     900
Profit/(loss) before tax and net finance costs 4,514 3,307 9,186
Other revenue 236 193 202
Operating revenue 13,179 13,994 16,817
Cost of sales (7,501) (7,519) (6,540)
Insurance (25) (60) (43)
Gross profit 5,678 6,475 10,277
Other income 624 322 735
Exploration and evaluation expenditure (320) (279) (296)
Amortisation of permit acquisition (8) (4) (10)
Write-offs (9) (77) (164)
Exploration and evaluation (337) (360) (470)
General, administrative and other costs (445) (453) (791)
Amortisation of intangible assets (21) (2)  
Depreciation of lease assets (210) (179) (140)
Restoration movement (199) (147) (272)
Other (576) (432) (1,053)
Other costs (1,451) (1,213) (2,256)
Other expenses (1,788) (1,573) (2,726)
Operating segments [member] | Property, plant and equipment [Member]      
Disclosure of operating segments [line items]      
Depreciation and amortisation (4,523) (3,956) (2,798)
Operating segments [member] | Australia Segment [Member]      
Disclosure of operating segments [line items]      
Impairment losses   (534)  
Impairment reversals     900
Profit/(loss) before tax and net finance costs 4,614 4,487 9,415
Other revenue 197 18 (280)
Operating revenue 8,541 9,802 12,299
Cost of sales (4,159) (4,660) (4,181)
Insurance (27) (41) (35)
Gross profit 4,382 5,142 8,118
Other income 568 160 722
Exploration and evaluation expenditure (44) (24) (20)
Amortisation of permit acquisition   0 (1)
Write-offs (3) (31)  
Exploration and evaluation (47) (55) (21)
General, administrative and other costs     (13)
Depreciation of lease assets (58) (50) (49)
Restoration movement (176) (125) (234)
Other (55) (51) (8)
Other costs (289) (226) (304)
Other expenses (336) (281) (325)
Operating segments [member] | Australia Segment [Member] | External Customers [member]      
Disclosure of operating segments [line items]      
Operating revenue (23) (166) (455)
Operating segments [member] | Australia Segment [Member] | Property, plant and equipment [Member]      
Disclosure of operating segments [line items]      
Depreciation and amortisation (2,621) (2,754) (2,326)
Operating segments [member] | International Segment [Member]      
Disclosure of operating segments [line items]      
Impairment losses   (1,383)  
Profit/(loss) before tax and net finance costs 601 (808) 125
Other revenue (7) (15) (5)
Operating revenue 3,405 2,549 1,570
Cost of sales (2,472) (1,689) (837)
Insurance (9) (11) (7)
Gross profit 933 860 733
Other income 50 54 4
Exploration and evaluation expenditure (276) (253) (277)
Amortisation of permit acquisition (8) (4) (9)
Write-offs (6) (46) (164)
Exploration and evaluation (290) (303) (450)
General, administrative and other costs     (21)
Depreciation of lease assets (1) (14) (11)
Restoration movement 6 (22) (46)
Other (97)   (84)
Other costs (92) (36) (162)
Other expenses (382) (339) (612)
Operating segments [member] | International Segment [Member] | External Customers [member]      
Disclosure of operating segments [line items]      
Operating revenue (7) (15) (5)
Operating segments [member] | International Segment [Member] | Property, plant and equipment [Member]      
Disclosure of operating segments [line items]      
Depreciation and amortisation (1,848) (1,168) (439)
Operating segments [member] | Marketing [member]      
Disclosure of operating segments [line items]      
Profit/(loss) before tax and net finance costs 427 375 848
Other revenue 46 190 487
Operating revenue 1,233 1,643 2,948
Cost of sales (821) (1,110) (1,620)
Gross profit 412 533 1,328
Other income 23 26 5
General, administrative and other costs     (10)
Depreciation of lease assets (101) (75)  
Other 93 (109) (475)
Other costs (8) (184) (485)
Other expenses (8) (184) (485)
Operating segments [member] | Marketing [member] | External Customers [member]      
Disclosure of operating segments [line items]      
Operating revenue 30 181 460
Operating segments [member] | New energy/Corporate [Member]      
Disclosure of operating segments [line items]      
Profit/(loss) before tax and net finance costs (1,128) (747) (1,202)
Cost of sales (49) (60) 98
Insurance 11 (8) (1)
Gross profit (49) (60) 98
Other income (17) 82 4
Exploration and evaluation expenditure   (2) 1
Exploration and evaluation   (2) 1
General, administrative and other costs (445) (453) (747)
Amortisation of intangible assets (21) (2)  
Depreciation of lease assets (50) (40) (80)
Restoration movement (29)   8
Other (517) (272) (486)
Other costs (1,062) (767) (1,305)
Other expenses (1,062) (769) (1,304)
Operating segments [member] | New energy/Corporate [Member] | Property, plant and equipment [Member]      
Disclosure of operating segments [line items]      
Depreciation and amortisation (54) (34) (33)
Liquefied natural gas [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 6,401 8,165 11,289
Liquefied natural gas [member] | Operating segments [member] | Australia Segment [Member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 5,361 6,867 8,855
Liquefied natural gas [member] | Operating segments [member] | Marketing [member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 1,040 1,298 2,434
Pipeline gas [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 1,349 1,374 1,362
Pipeline gas [member] | Operating segments [member] | Australia Segment [Member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 1,119 1,088 1,086
Pipeline gas [member] | Operating segments [member] | International Segment [Member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 230 286 276
Crude oil and condensate [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 4,887 3,981 3,758
Crude oil and condensate [member] | Operating segments [member] | Australia Segment [Member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 1,668 1,611 2,467
Crude oil and condensate [member] | Operating segments [member] | International Segment [Member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 3,143 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 76 124 18
Natural gas liquids [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 306 281 206
Natural gas liquids [member] | Operating segments [member] | Australia Segment [Member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 196 218 171
Natural gas liquids [member] | Operating segments [member] | International Segment [Member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 39 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 71 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 12,943 13,801 16,615
Revenue from sale of hydrocarbons [member] | Operating segments [member] | Australia Segment [Member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 8,344 9,784 12,579
Revenue from sale of hydrocarbons [member] | Operating segments [member] | International Segment [Member]      
Disclosure of operating segments [line items]      
Revenue from sale of oil and gas products 3,412 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 1,187 1,453 2,461
Processing and services revenue [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Other revenue 220 184 175
Processing and services revenue [member] | Operating segments [member] | Australia Segment [Member]      
Disclosure of operating segments [line items]      
Other revenue 220 184 175
Shipping and other revenue [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Other revenue 16 9 27
Shipping and other revenue [member] | Operating segments [member] | Marketing [member]      
Disclosure of operating segments [line items]      
Other revenue 16 9 27
Production costs [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Cost of sales (1,579) (1,562) (1,281)
Production costs [member] | Operating segments [member] | Australia Segment [Member]      
Disclosure of operating segments [line items]      
Cost of sales (1,051) (1,173) (975)
Production costs [member] | Operating segments [member] | International Segment [Member]      
Disclosure of operating segments [line items]      
Cost of sales (528) (389) (313)
Production costs [member] | Operating segments [member] | New energy/Corporate [Member]      
Disclosure of operating segments [line items]      
Cost of sales     7
Royalties excise and levies [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Cost of sales (372) (503) (596)
Royalties excise and levies [member] | Operating segments [member] | Australia Segment [Member]      
Disclosure of operating segments [line items]      
Cost of sales (349) (462) (540)
Royalties excise and levies [member] | Operating segments [member] | International Segment [Member]      
Disclosure of operating segments [line items]      
Cost of sales (23) (41) (39)
Royalties excise and levies [member] | Operating segments [member] | New energy/Corporate [Member]      
Disclosure of operating segments [line items]      
Cost of sales     (17)
Inventory movement [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Inventory movement 84 (37) 41
Inventory movement [member] | Operating segments [member] | Australia Segment [Member]      
Disclosure of operating segments [line items]      
Inventory movement 55 (40) 44
Inventory movement [member] | Operating segments [member] | International Segment [Member]      
Disclosure of operating segments [line items]      
Inventory movement 29 3 (3)
Costs of production [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Cost of sales (1,892) (2,162) (1,879)
Costs of production [member] | Operating segments [member] | Australia Segment [Member]      
Disclosure of operating segments [line items]      
Cost of sales (1,372) (1,716) (1,506)
Costs of production [member] | Operating segments [member] | International Segment [Member]      
Disclosure of operating segments [line items]      
Cost of sales (531) (438) (362)
Costs of production [member] | Operating segments [member] | New energy/Corporate [Member]      
Disclosure of operating segments [line items]      
Cost of sales 11 (8) (11)
Shipping and direct sales costs [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Cost of sales (305) (319) (279)
Shipping and direct sales costs [member] | Operating segments [member] | Australia Segment [Member]      
Disclosure of operating segments [line items]      
Cost of sales (89) (164) (312)
Shipping and direct sales costs [member] | Operating segments [member] | International Segment [Member]      
Disclosure of operating segments [line items]      
Cost of sales (86) (83) (36)
Shipping and direct sales costs [member] | Operating segments [member] | Marketing [member]      
Disclosure of operating segments [line items]      
Cost of sales (130) (54) (73)
Shipping and direct sales costs [member] | Operating segments [member] | New energy/Corporate [Member]      
Disclosure of operating segments [line items]      
Cost of sales   (18) 142
Trading costs [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Cost of sales (695) (1,068) (1,777)
Trading costs [member] | Operating segments [member] | Australia Segment [Member]      
Disclosure of operating segments [line items]      
Cost of sales (4) (12) (14)
Trading costs [member] | Operating segments [member] | Marketing [member]      
Disclosure of operating segments [line items]      
Cost of sales (691) (1,056) (1,763)
Other hydrocarbon costs [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Cost of sales (51) (7) (19)
Other hydrocarbon costs [member] | Operating segments [member] | Australia Segment [Member]      
Disclosure of operating segments [line items]      
Cost of sales (51) (7) (19)
Other cost of sales [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Cost of sales (35) (7) (4)
Other cost of sales [member] | Operating segments [member] | Australia Segment [Member]      
Disclosure of operating segments [line items]      
Cost of sales (22) (7) (4)
Other cost of sales [member] | Operating segments [member] | International Segment [Member]      
Disclosure of operating segments [line items]      
Cost of sales (7)    
Other cost of sales [member] | Operating segments [member] | New energy/Corporate [Member]      
Disclosure of operating segments [line items]      
Cost of sales (6)    
Movement in onerous contract provision [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Cost of sales     216
Movement in onerous contract provision [member] | Operating segments [member] | Marketing [member]      
Disclosure of operating segments [line items]      
Cost of sales     216
Total other cost of sales [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Cost of sales (1,086) (1,401) (1,863)
Total other cost of sales [member] | Operating segments [member] | Australia Segment [Member]      
Disclosure of operating segments [line items]      
Cost of sales (166) (190) (349)
Total other cost of sales [member] | Operating segments [member] | International Segment [Member]      
Disclosure of operating segments [line items]      
Cost of sales (93) (83) (36)
Total other cost of sales [member] | Operating segments [member] | Marketing [member]      
Disclosure of operating segments [line items]      
Cost of sales (821) (1,110) (1,620)
Total other cost of sales [member] | Operating segments [member] | New energy/Corporate [Member]      
Disclosure of operating segments [line items]      
Cost of sales $ (6) $ (18) $ 142