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Income taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2025
Effective Income Tax Rate Reconciliation [Line Items]          
Effective tax rate 12.20% 15.50% 13.30% 14.80%  
Recognition of recoveries due to Ukraine conflict     $ 146    
Income tax benefit from reversal of Pillar 2 provision     $ 41    
Deduction, amount       $ 8  
Forecast          
Effective Income Tax Rate Reconciliation [Line Items]          
Effective tax rate         15.50%