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Property, Plant and Equipment - Detailed Information About Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance $ 23,664  
Ending balance 22,998 $ 23,664
Carrying amount 22,998 23,664
Acquisition cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 56,987 51,547
Effect of movements in foreign exchange 669 3,669
Acquisitions 985 2,744
Disposals through sale and derecognition (638) (2,644)
Disposals through the sale of subsidiaries   (27)
Transfer (to)/from other asset categories and other movements 57 1,698
Ending balance 58,060 56,987
Carrying amount 58,060 56,987
Depreciation and impairment losses [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (35,619) (30,252)
Effect of movements in foreign exchange (282) (2,082)
Depreciation (1,660) (3,329)
Disposals through sale and derecognition 619 2,572
Disposals through the sale of subsidiaries   18
Impairment losses (108) (456)
Transfer (to)/from other asset categories and other movements (143) (2,090)
Ending balance (37,193) (35,619)
Carrying amount (37,193) (35,619)
Land and buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 7,486  
Ending balance 7,518 7,486
Carrying amount 7,518 7,486
Land and buildings [member] | Acquisition cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 13,229  
Effect of movements in foreign exchange 182  
Acquisitions 18  
Disposals through sale and derecognition (3)  
Transfer (to)/from other asset categories and other movements 41  
Ending balance 13,467 13,229
Carrying amount 13,467 13,229
Land and buildings [member] | Depreciation and impairment losses [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (5,743)  
Effect of movements in foreign exchange (52)  
Depreciation (196)  
Disposals through sale and derecognition 2  
Transfer (to)/from other asset categories and other movements 40  
Ending balance (5,949) (5,743)
Carrying amount (5,949) (5,743)
Plant and equipment fixtures and fittings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 12,871  
Ending balance 12,661 12,871
Carrying amount 12,661 12,871
Plant and equipment fixtures and fittings [member] | Acquisition cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 42,747  
Effect of movements in foreign exchange 463  
Acquisitions 367  
Disposals through sale and derecognition (634)  
Transfer (to)/from other asset categories and other movements 962  
Ending balance 43,906 42,747
Carrying amount 43,906 42,747
Plant and equipment fixtures and fittings [member] | Depreciation and impairment losses [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (29,876)  
Effect of movements in foreign exchange (230)  
Depreciation (1,464)  
Disposals through sale and derecognition 617  
Impairment losses (108)  
Transfer (to)/from other asset categories and other movements (183)  
Ending balance (31,244) (29,876)
Carrying amount (31,244) (29,876)
Under construction [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 1,011  
Ending balance 688 1,011
Carrying amount 688 1,011
Under construction [member] | Acquisition cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 1,011  
Effect of movements in foreign exchange 23  
Acquisitions 600  
Disposals through sale and derecognition (1)  
Transfer (to)/from other asset categories and other movements (946)  
Ending balance 688 1,011
Carrying amount 688 1,011
Property Plant And Equipment Owned [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 21,368  
Ending balance 20,867 21,368
Carrying amount $ 20,867 $ 21,368