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Property, Plant and Equipment - Detailed Information About Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance $ 26,419  
Ending balance 26,678 $ 26,419
Carrying amount 26,678 26,419
Acquisition cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 48,993 48,757
Effect of movements in foreign exchange (1,616) (1,644)
Acquisitions 4,739 3,188
Acquisitions through business combinations 2 111
Disposals through sale and derecognition (1,301) (1,274)
Disposals through the sale of subsidiaries (51) 0
Transfer (to)/from other asset categories and other movements (23) (145)
Ending balance 50,742 48,993
Carrying amount 50,742 48,993
Depreciation and impairment losses [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (24,802) (23,242)
Effect of movements in foreign exchange 813 625
Depreciation (3,384) (3,250)
Disposals through sale and derecognition 1,168 1,130
Disposals through the sale of subsidiaries 46 0
Impairment losses (182) (145)
Transfer (to)/from other asset categories and other movements 57 80
Ending balance (26,284) (24,802)
Carrying amount (26,284) (24,802)
Land and buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 8,287  
Ending balance 8,082 8,287
Carrying amount 8,082 8,287
Land and buildings [member] | Acquisition cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 12,237  
Effect of movements in foreign exchange (383)  
Acquisitions 44  
Acquisitions through business combinations 0  
Disposals through sale and derecognition (104)  
Disposals through the sale of subsidiaries (18)  
Transfer (to)/from other asset categories and other movements 598  
Ending balance 12,374 12,237
Carrying amount 12,374 12,237
Land and buildings [member] | Depreciation and impairment losses [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (3,950)  
Effect of movements in foreign exchange 123  
Depreciation (376)  
Disposals through sale and derecognition 64  
Disposals through the sale of subsidiaries 17  
Impairment losses (19)  
Transfer (to)/from other asset categories and other movements (151)  
Ending balance (4,292) (3,950)
Carrying amount (4,292) (3,950)
Plant and equipment fixtures and fittings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 14,124  
Ending balance 13,915 14,124
Carrying amount 13,915 14,124
Plant and equipment fixtures and fittings [member] | Acquisition cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 34,976  
Effect of movements in foreign exchange (1,162)  
Acquisitions 1,296  
Acquisitions through business combinations 2  
Disposals through sale and derecognition (1,197)  
Disposals through the sale of subsidiaries (33)  
Transfer (to)/from other asset categories and other movements 2,025  
Ending balance 35,906 34,976
Carrying amount 35,906 34,976
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 (20,852)  
Effect of movements in foreign exchange 690  
Depreciation (3,008)  
Disposals through sale and derecognition   1,104
Disposals through the sale of subsidiaries 29  
Impairment losses (161)  
Transfer (to)/from other asset categories and other movements 206  
Ending balance (21,992) (20,852)
Carrying amount (21,992) (20,852)
Under construction [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 1,780  
Ending balance 2,462 1,780
Carrying amount 2,462 1,780
Under construction [member] | Acquisition cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 1,780  
Effect of movements in foreign exchange (70)  
Acquisitions 3,399  
Acquisitions through business combinations 0  
Disposals through sale and derecognition (1)  
Transfer (to)/from other asset categories and other movements (2,646)  
Ending balance 2,462 1,780
Carrying amount 2,462 1,780
Under construction [member] | Depreciation and impairment losses [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Impairment losses (2)  
Transfer (to)/from other asset categories and other movements 2  
Property Plant And Equipment Owned [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 24,191  
Ending balance 24,459 24,191
Carrying amount $ 24,459 $ 24,191