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Employee Future Benefits - Costs Recognized (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost $ 12 $ 10 $ 11
Administration expenses 1 2 2
Defined benefit expense 22 21 22
Defined contribution expense 10 11 15
Net expense 32 32 37
Defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 12 10  
Interest cost 22 24 25
Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost (13) (15) (16)
Registered      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 9 7 7
Administration expenses 1 2 2
Defined benefit expense 15 14 14
Defined contribution expense 10 11 15
Net expense 25 25 29
Registered | Defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 9 7  
Interest cost 18 20 21
Registered | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost (13) (15) (16)
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 5
Defined contribution expense 0 0 0
Net expense 5 5 5
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
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 1 1 2
Administration expenses 0 0 0
Defined benefit expense 2 2 3
Defined contribution expense 0 0 0
Net expense 2 2 3
Other | Defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 1 1  
Interest cost 1 1 1
Other | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost $ 0 $ 0 $ 0