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Employee Future Benefits - Costs Recognized (Details) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost CAD 10 CAD 11 CAD 11
Administration expenses 2 2 2
Defined benefit expense 21 22 14
Defined contribution expense 11 15 21
Net expense 32 37 35
Defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 10 11  
Interest cost 24 25 25
Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost (15) (16) (16)
Curtailment and amendment gain     (8)
Registered      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 7 7 7
Administration expenses 2 2 2
Defined benefit expense 14 14 14
Defined contribution expense 11 15 21
Net expense 25 29 35
Registered | Defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 7 7  
Interest cost 20 21 21
Registered | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost (15) (16) (16)
Curtailment and amendment gain     0
Supplemental      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 2 2 2
Administration expenses 0 0 0
Defined benefit expense 5 5 0
Defined contribution expense 0 0 0
Net expense 5 5 0
Supplemental | Defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 2 2  
Interest cost 3 3 3
Supplemental | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost 0 0 0
Curtailment and amendment gain     (5)
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 1 2 2
Administration expenses 0 0 0
Defined benefit expense 2 3 0
Defined contribution expense 0 0 0
Net expense 2 3 0
Other | Defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 1 2  
Interest cost 1 1 1
Other | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost CAD 0 CAD 0 0
Curtailment and amendment gain     CAD (3)