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employee future benefits - Assumptions (Details) - Pension plans
$ in Millions
 12 Months Ended
Dec. 31, 2024
CAD ($)
Dec. 31, 2023
CAD ($)
Financial assumptions    
Life expectancy at 65 for a member currently at age 65 (years) 24.3 24.2
Discount rate used to determine net benefit costs 4.65% 5.05%
Discount rate used to determine defined benefit obligations 4.65% 4.65%
Discount rate used to determine current service cost in subsequent fiscal year 4.80% 4.65%
Rate of future increases in compensation used to determine net benefit costs 3.00% 3.00%
Rate of future increases in compensation used to defined benefit obligations 3.00% 3.00%
Sensitivity of key assumptions    
Increase in life expectancy in actuarial assumption 1 year 1 year
Decrease in actuarial assumption (as a per cent) 0.25% 0.25%
Life expectancy    
Sensitivity of key assumptions    
Effect of increase in actuarial assumption on obligation $ 242 $ 238
Effect of increase in actuarial assumption on expense 2 8
Discount rate    
Sensitivity of key assumptions    
Effect of decrease in actuarial assumption on expense 4 10
Effect of decrease in actuarial assumption on obligation 250 256
Rate of future increases in compensation    
Sensitivity of key assumptions    
Effect of decrease in actuarial assumption on expense (1) (2)
Effect of decrease in actuarial assumption on obligation $ (20) $ (23)