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Property, Plant and Equipment - Detailed Information About Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance $ 26,671  
Ending balance 26,818 $ 26,671
Carrying amount 26,818 26,671
Acquisition cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 52,269 50,742
Effect of movements in foreign exchange 1,039 (983)
Acquisitions 3,890 4,279
Disposals through sale and derecognition (1,665) (1,822)
Disposals through the sale of subsidiaries 0 (13)
Transfer (to)/from other asset categories and other movements (1,011) 66
Ending balance 54,522 52,269
Carrying amount 54,522 52,269
Depreciation and impairment losses [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (28,024) (26,284)
Effect of movements in foreign exchange (594) 507
Depreciation (3,573) (3,530)
Disposals through sale and derecognition 1,533 1,631
Disposals through the sale of subsidiaries 0 8
Impairment losses (181) (172)
Transfer (to)/from other asset categories and other movements 409 (186)
Ending balance (30,430) (28,024)
Carrying amount (30,430) (28,024)
Land and buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 8,007  
Ending balance 8,054 8,007
Carrying amount 8,054 8,007
Land and buildings [member] | Acquisition cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 12,591  
Effect of movements in foreign exchange 259  
Acquisitions 38  
Disposals through sale and derecognition (55)  
Disposals through the sale of subsidiaries 0  
Transfer (to)/from other asset categories and other movements 237  
Ending balance 13,071 12,591
Carrying amount 13,071 12,591
Land and buildings [member] | Depreciation and impairment losses [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (4,584)  
Effect of movements in foreign exchange (86)  
Depreciation (397)  
Disposals through sale and derecognition 33  
Impairment losses (8)  
Transfer (to)/from other asset categories and other movements 24  
Ending balance (5,017) (4,584)
Carrying amount (5,017) (4,584)
Plant and equipment fixtures and fittings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 14,033  
Ending balance 14,370 14,033
Carrying amount 14,370 14,033
Plant and equipment fixtures and fittings [member] | Acquisition cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 37,473  
Effect of movements in foreign exchange 754  
Acquisitions 1,361  
Disposals through sale and derecognition (1,607)  
Disposals through the sale of subsidiaries 0  
Transfer (to)/from other asset categories and other movements 1,802  
Ending balance 39,783 37,473
Carrying amount 39,783 37,473
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 (23,440)  
Effect of movements in foreign exchange (508)  
Depreciation (3,176)  
Disposals through sale and derecognition 1,500  
Disposals through the sale of subsidiaries 0  
Impairment losses (173)  
Transfer (to)/from other asset categories and other movements 384  
Ending balance (25,414) (23,440)
Carrying amount (25,414) (23,440)
Under construction [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 2,205  
Ending balance 1,669 2,205
Carrying amount 1,669 2,205
Under construction [member] | Acquisition cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 2,205  
Effect of movements in foreign exchange 27  
Acquisitions 2,490  
Disposals through sale and derecognition (3)  
Transfer (to)/from other asset categories and other movements (3,050)  
Ending balance 1,669 2,205
Carrying amount 1,669 2,205
Under construction [member] | Depreciation and impairment losses [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Impairment losses 0  
Transfer (to)/from other asset categories and other movements 0  
Property Plant And Equipment Owned [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 24,245  
Ending balance 24,092 24,245
Carrying amount $ 24,092 $ 24,245