v3.26.1
financing costs (Details) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Interest expense            
Long-term debt, excluding lease liabilities and other - gross $ 327 $ 306 $ 655 $ 590    
Long-term debt, excluding lease liabilities and other - capitalized (3)   (6) (9)    
Long-term debt, excluding lease liabilities and other - net 324 306 649 581    
Short-term borrowings and other 17 12 30 29    
Long-term debt prepayment premium 51   51      
Total 392 318 730 610    
Long-term debt - lease liabilities 41 42 84 83    
Long-term debt - other 6 8 11 14    
Employee defined benefit plans net interest 4 3 7 6    
Accretion on provisions 5 7 13 14    
Interest expense from transactions that do not only involve the raising of finance, Total 56 60 115 117    
Interest expense other than foreign exchange and unrealized changes 448 378 845 727    
Foreign exchange (7) 12 (44) 12    
Total 441 390 801 739    
Interest income (21) (17) (46) (22)    
Net 420 373 755 717    
Net interest cost     754 720 $ 1,497 $ 1,404
Interest expense on long-term debt, excluding lease liabilities and other - capitalized     (6) (9)    
Employee defined benefit plans net interest $ 4 $ 3 $ 7 $ 6    
Composite interest rate on long-term debt, excluding lease liabilities (as a percent)     5.30% 5.30%