v3.25.4
Commitments and contingencies - Narrative (Details) - CAD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2025
Dec. 31, 2024
Disclosure of contingent liabilities [line items]      
Operating revenues   $ 24,468 $ 24,409
Legal proceedings contingent liability      
Disclosure of contingent liabilities [line items]      
Operating revenues $ 44