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employee future benefits - Defined benefit pension plans expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Defined benefit pension plan expense (recovery)    
Total $ 102 $ 78
Pension plans    
Defined benefit pension plan expense (recovery)    
Discount rate used to determine defined benefit obligations 2.50% 3.10%
Pension plans | Pension plan    
Defined benefit pension plan expense (recovery)    
Current service cost $ 92 $ 72
Past service costs 3  
Interest expense arising from defined benefit obligations accrued 297 335
Return, including interest income, on plan assets (765) (752)
Interest effect on asset ceiling limit 4 10
Total (464) (407)
Administrative fees 7 6
Re-measurements arising from demographic assumptions 67 20
Re-measurements arising from financial assumptions 836 984
Total 903 1,004
Changes in the effect of limiting net defined benefit assets to the asset ceiling (2) (152)
Total 539 523
Pension plans | Pension plan | Employee benefits expense    
Defined benefit pension plan expense (recovery)    
Current service cost 92 72
Past service cost 3  
Administrative fees 7 6
Total 102 78
Pension plans | Pension plan | Financing costs    
Defined benefit pension plan expense (recovery)    
Interest expense arising from defined benefit obligations accrued 297 335
Return, including interest income, on plan assets (285) (344)
Interest effect on asset ceiling limit 4 10
Total 16 1
Total 16 1
Pension plans | Pension plan | Other comprehensive income    
Defined benefit pension plan expense (recovery)    
Return, including interest income, on plan assets (480) (408)
Total (480) (408)
Re-measurements arising from demographic assumptions 67 20
Re-measurements arising from financial assumptions 836 984
Total 903 1,004
Changes in the effect of limiting net defined benefit assets to the asset ceiling (2) (152)
Defined benefit pension plan expense (recovery) $ 421 $ 444