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employee future benefits - Defined benefit pension plans expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Defined benefit pension plan expense (recovery)    
Total $ 95 $ 82
Pension plans | Pension plan    
Defined benefit pension plan expense (recovery)    
Current service cost 88 78
Past service costs 1 (2)
Interest expense arising from defined benefit obligations accrued 318 331
Return, including interest income, on plan assets (255) (690)
Interest effect on asset ceiling limit 4 4
Total 67 (355)
Administrative fees 6 6
Re-measurements arising from demographic assumptions (62) 77
Re-measurements arising financial assumptions (588) 526
Total (650) 603
Changes in the effect of limiting net defined benefit assets to the asset ceiling 149 (9)
Total (339) 321
Pension plans | Pension plan | Employee benefits expense    
Defined benefit pension plan expense (recovery)    
Current service cost 88 78
Past service cost 1 (2)
Administrative fees 6 6
Total 95 82
Pension plans | Pension plan | Financing costs    
Defined benefit pension plan expense (recovery)    
Interest expense arising from defined benefit obligations accrued 318 331
Return, including interest income, on plan assets (306) (330)
Interest effect on asset ceiling limit 4 4
Total 16 5
Total 16 5
Pension plans | Pension plan | Other comprehensive income    
Defined benefit pension plan expense (recovery)    
Return, including interest income, on plan assets 51 (360)
Total 51 (360)
Re-measurements arising from demographic assumptions (62) 77
Re-measurements arising Financial assumptions (588) 526
Total (650) 603
Changes in the effect of limiting net defined benefit assets to the asset ceiling 149 (9)
Defined benefit pension plan expense (recovery) $ (450) $ 234