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Leases - Summary of Lease Assets and Lease Liabilities (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about lease assets and lease liabilities [line items]    
Carrying amount, beginning balance $ 1,230 $ 1,264
Acquisitions through assets acquisitions 172  
Additions 148 128
Transfer to assets held for sale   (3)
Lease remeasurements 43 191
Disposals at written down value (2)  
Depreciation of lease assets (300) (350)
Carrying amount, ending balance 1,291 1,230
Lease liabilities, beginning balance 1,615 1,634
Acquisitions through assets acquisitions 178  
Additions 148 145
Disposals (8)  
Transfer to liabilities directly associated with assets held for sale   (7)
Repayments (principal and interest) (411) (469)
Accretion of interest 102 102
Lease remeasurements (1) 210
Lease liabilities, ending balance 1,623 1,615
Current 189 298
Non-current 1,434 1,317
Carrying amount 1,623 1,615
Gross carrying amount [member]    
Disclosure of detailed information about lease assets and lease liabilities [line items]    
Carrying amount, beginning balance 2,217  
Carrying amount, ending balance 2,578 2,217
Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about lease assets and lease liabilities [line items]    
Carrying amount, beginning balance (987)  
Carrying amount, ending balance (1,287) (987)
Land and buildings [member]    
Disclosure of detailed information about lease assets and lease liabilities [line items]    
Carrying amount, beginning balance 430 464
Acquisitions through assets acquisitions 172  
Additions 37 8
Transfer to assets held for sale   0
Lease remeasurements 16 7
Disposals at written down value 0  
Depreciation of lease assets (52) (49)
Carrying amount, ending balance 603 430
Lease liabilities, beginning balance 607 623
Acquisitions through assets acquisitions 178  
Additions 37 24
Disposals 0  
Transfer to liabilities directly associated with assets held for sale   0
Repayments (principal and interest) (83) (78)
Accretion of interest 26 27
Lease remeasurements (31) 11
Lease liabilities, ending balance 734 607
Current 55 54
Non-current 679 553
Carrying amount 734 607
Land and buildings [member] | Gross carrying amount [member]    
Disclosure of detailed information about lease assets and lease liabilities [line items]    
Carrying amount, beginning balance 600  
Carrying amount, ending balance 825 600
Land and buildings [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about lease assets and lease liabilities [line items]    
Carrying amount, beginning balance (170)  
Carrying amount, ending balance (222) (170)
Oil and gas properties [member]    
Disclosure of detailed information about lease assets and lease liabilities [line items]    
Carrying amount, beginning balance 107 225
Acquisitions through assets acquisitions 0  
Additions 0 0
Transfer to assets held for sale   (3)
Lease remeasurements 17 59
Disposals at written down value (1)  
Depreciation of lease assets (106) (174)
Carrying amount, ending balance 17 107
Lease liabilities, beginning balance 130 238
Acquisitions through assets acquisitions 0  
Additions 0 0
Disposals (7)  
Transfer to liabilities directly associated with assets held for sale   (6)
Repayments (principal and interest) (118) (188)
Accretion of interest 4 12
Lease remeasurements 24 74
Lease liabilities, ending balance 33 130
Current 32 114
Non-current 1 16
Carrying amount 33 130
Oil and gas properties [member] | Gross carrying amount [member]    
Disclosure of detailed information about lease assets and lease liabilities [line items]    
Carrying amount, beginning balance 502  
Carrying amount, ending balance 518 502
Oil and gas properties [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about lease assets and lease liabilities [line items]    
Carrying amount, beginning balance (395)  
Carrying amount, ending balance (501) (395)
Other plant and equipment [member]    
Disclosure of detailed information about lease assets and lease liabilities [line items]    
Carrying amount, beginning balance 693 575
Acquisitions through assets acquisitions 0  
Additions 111 120
Transfer to assets held for sale   0
Lease remeasurements 10 125
Disposals at written down value (1)  
Depreciation of lease assets (142) (127)
Carrying amount, ending balance 671 693
Lease liabilities, beginning balance 878 773
Acquisitions through assets acquisitions 0  
Additions 111 121
Disposals (1)  
Transfer to liabilities directly associated with assets held for sale   (1)
Repayments (principal and interest) (210) (203)
Accretion of interest 72 63
Lease remeasurements 6 125
Lease liabilities, ending balance 856 878
Current 102 130
Non-current 754 748
Carrying amount 856 878
Other plant and equipment [member] | Gross carrying amount [member]    
Disclosure of detailed information about lease assets and lease liabilities [line items]    
Carrying amount, beginning balance 1,115  
Carrying amount, ending balance 1,235 1,115
Other plant and equipment [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about lease assets and lease liabilities [line items]    
Carrying amount, beginning balance (422)  
Carrying amount, ending balance $ (564) $ (422)