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Goodwill - Reconciliation of Goodwill (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill beginning balance $ 110,479  
Goodwill ending balance 117,908 $ 110,479
Carrying amount 117,908 110,479
Acquisition cost [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill beginning balance 112,637 119,302
Effect of movements in foreign exchange 7,634 (7,082)
Transfers (to)/from other assets categories [1] (164) (7)
Hyperinflation monetary adjustments 169 425
Goodwill ending balance 120,276 112,637
Carrying amount 120,276 112,637
Impairment losses [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill beginning balance (2,158) (2,259)
Effect of movements in foreign exchange (209) 101
Goodwill ending balance (2,368) (2,158)
Carrying amount $ (2,368) $ (2,158)
[1] The transfer (to)/from other asset categories relates mainly to the separate presentation in the statement of financial position of goodwill held for sale in accordance with IFRS 5 Non-current assets held for sale and discontinued operations.