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Goodwill - Reconciliation of Goodwill (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill beginning balance $ 117,908  
Goodwill ending balance 119,946 $ 117,908
Carrying amount 119,946 117,908
Acquisition cost [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill beginning balance 120,276 112,637
Effect of movements in foreign exchange 1,608 7,634
 Acquisitions through business combinations 342 0
Transfers (to)/from other assets categories and other movements [1] (61) (164)
Hyperinflation monetary adjustments 125 169
Goodwill ending balance 122,289 120,276
Carrying amount 122,289 120,276
Impairment losses [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill beginning balance (2,368) (2,158)
Effect of movements in foreign exchange (36) (209)
Transfers (to)/from other assets categories and other movements [1] 61 0
Goodwill ending balance (2,343) (2,368)
Carrying amount $ (2,343) $ (2,368)
[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.