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Employee Future Benefits - Costs Recognized (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost $ 10 $ 12 $ 10
Administration expenses 2 1 2
Defined benefit expense 19 22 21
Defined contribution expense 9 10 11
Net expense 28 32 32
Defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost 23 22 24
Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost (13) (13) (15)
Curtailment and amendment gain (3)    
Registered      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 7 9 7
Administration expenses 2 1 2
Defined benefit expense 13 15 14
Defined contribution expense 9 10 11
Net expense 22 25 25
Registered | Defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 7 9  
Interest cost 19 18 20
Curtailment and amendment gain (3)    
Registered | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost (12) (13) (15)
Curtailment and amendment gain (3)    
Supplemental Pension Plan      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 2 2 2
Administration expenses 0 0 0
Defined benefit expense 4 5 5
Defined contribution expense 0 0 0
Net expense 4 5 5
Supplemental Pension Plan | Defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 2 2  
Interest cost 3 3 3
Curtailment and amendment gain 0    
Supplemental Pension Plan | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost (1) 0 0
Curtailment and amendment gain 0    
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 1 1 1
Administration expenses 0 0 0
Defined benefit expense 2 2 2
Defined contribution expense 0 0 0
Net expense 2 2 2
Other | Defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 1 1  
Interest cost 1 1 1
Curtailment and amendment gain 0    
Other | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost 0 $ 0 $ 0
Curtailment and amendment gain $ 0