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Income taxes - Disclosure of deferred tax assets and liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets $ 36 $ 33
Deferred tax liability (2) (1)
Total 34 32
Losses carried forward    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Total 71 55
Allowance for credit losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Total 12 19
Intangible assets    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Total (78) (57)
Other    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Total $ 30 $ 15