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Property, Plant and Equipment - Detailed Information About Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance $ 26,818  
Ending balance 23,503 $ 26,818
Carrying amount 23,503 26,818
Acquisition cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 54,522 52,269
Effect of movements in foreign exchange (4,424) 1,039
Acquisitions 2,989 3,890
Acquisitions through business combinations 16 0
Disposals through sale and derecognition (2,271) (1,665)
Disposals through the sale of subsidiaries (9) 0
Transfer (to)/from other asset categories and other movements [1] 724 (1,011)
Ending balance 51,547 54,522
Carrying amount 51,547 54,522
Depreciation and impairment losses [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (30,430) (28,024)
Effect of movements in foreign exchange 2,367 (594)
Depreciation (3,518) (3,573)
Disposals through sale and derecognition 2,121 1,533
Disposals through the sale of subsidiaries 5 0
Impairment losses (247) (181)
Transfer (to)/from other asset categories and other movements [1] (550) 409
Ending balance (30,252) (30,430)
Carrying amount (30,252) (30,430)
Land and buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 8,054  
Ending balance 7,307 8,054
Carrying amount 7,307 8,054
Land and buildings [member] | Acquisition cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 13,071  
Effect of movements in foreign exchange (1,015)  
Acquisitions 25  
Acquisitions through business combinations 11  
Disposals through sale and derecognition (210)  
Disposals through the sale of subsidiaries (2)  
Transfer (to)/from other asset categories and other movements [1] 446  
Ending balance 12,325 13,071
Carrying amount 12,325 13,071
Land and buildings [member] | Depreciation and impairment losses [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (5,017)  
Effect of movements in foreign exchange 335  
Depreciation (391)  
Disposals through sale and derecognition 127  
Disposals through the sale of subsidiaries 1  
Impairment losses (29)  
Transfer (to)/from other asset categories and other movements [1] (44)  
Ending balance (5,018) (5,017)
Carrying amount (5,018) (5,017)
Plant and equipment fixtures and fittings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 14,370  
Ending balance 12,821 14,370
Carrying amount 12,821 14,370
Plant and equipment fixtures and fittings [member] | Acquisition cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 39,783  
Effect of movements in foreign exchange (3,240)  
Acquisitions 1,025  
Acquisitions through business combinations 5  
Disposals through sale and derecognition (2,051)  
Disposals through the sale of subsidiaries (7)  
Transfer (to)/from other asset categories and other movements [1] 2,540  
Ending balance 38,056 39,783
Carrying amount 38,056 39,783
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 (25,414)  
Effect of movements in foreign exchange 2,032  
Depreciation (3,127)  
Disposals through sale and derecognition 1,992  
Disposals through the sale of subsidiaries 4  
Impairment losses (215)  
Transfer (to)/from other asset categories and other movements [1] (506)  
Ending balance (25,235) (25,414)
Carrying amount (25,235) (25,414)
Under construction [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 1,669  
Ending balance 1,166 1,669
Carrying amount 1,166 1,669
Under construction [member] | Acquisition cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 1,669  
Effect of movements in foreign exchange (170)  
Acquisitions 1,940  
Acquisitions through business combinations 0  
Disposals through sale and derecognition (9)  
Transfer (to)/from other asset categories and other movements [1] (2,263)  
Ending balance 1,166 1,669
Carrying amount 1,166 1,669
Under construction [member] | Depreciation and impairment losses [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Disposals through sale and derecognition 2  
Impairment losses (2)  
Property Plant And Equipment Owned [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 24,092  
Ending balance 21,295 24,092
Carrying amount $ 21,295 $ 24,092
[1] The transfer (to)/from other asset categories and other movements relates mainly to transfers from assets under construction to their respective asset categories, to contributions of assets to pension plans, to the separate presentation in the statement of financial position of property, plant and equipment held for sale in accordance with IFRS 5 Non-current assets held for sale and discontinued operations and to the restatement of non-monetary assets under hyperinflation accounting in line with IAS 29 Financial reporting in hyperinflationary economies.