v3.25.4
Goodwill and intangible assets - Movement analysis of goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Reconciliation of changes in intangible assets and goodwill [abstract]    
Goodwill and intangible assets beginning balance $ 12,384  
Goodwill and intangible assets ending balance 13,107 $ 12,384
Goodwill    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Goodwill and intangible assets beginning balance 4,118  
Goodwill and intangible assets ending balance 4,419 4,118
Goodwill | Gross amount    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Goodwill and intangible assets beginning balance 18,626 19,560
Exchange differences 1,438 (962)
Reclassified to held for sale and additions (78) 28
Goodwill and intangible assets ending balance 19,986 18,626
Goodwill | Accumulated impairment losses    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Goodwill and intangible assets beginning balance (14,508) (15,237)
Exchange differences (1,059) 716
Reclassified to held for sale 0 13
Goodwill and intangible assets ending balance $ (15,567) $ (14,508)