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Pension Plans and Other Post-Retirement Benefits - Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance $ 467  
Change in defined benefit obligations:    
Current service cost 57 $ 59
Interest income (cost) (18) (22)
Settlement losses (gains) 1 0
Plan amendments 0 (1)
Foreign exchange rate movement 6 (4)
Change in plan assets:    
Administrative expense (1) (1)
Return on plan assets (excluding amounts included in net interest expense) 306 (156)
Fair value of plan assets 3,596 3,253
Defined benefit (obligation) (4,084) (3,720)
Net defined benefit liability (asset) - ending balance 488 467
Pension    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance 205  
Change in defined benefit obligations:    
Current service cost 52 54
Interest income (cost) (8) (13)
Settlement losses (gains) 1 0
Plan amendments 0 (1)
Foreign exchange rate movement 2 (2)
Change in plan assets:    
Administrative expense (1) (1)
Return on plan assets (excluding amounts included in net interest expense) 306 (156)
Fair value of plan assets 3,596 3,253
Defined benefit (obligation) (3,805) (3,458)
Net defined benefit liability (asset) - ending balance 209 205
Other post-retirement    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance 262  
Change in defined benefit obligations:    
Current service cost 5 5
Interest income (cost) (10) (9)
Settlement losses (gains) 0 0
Plan amendments 0 0
Foreign exchange rate movement 4 (2)
Change in plan assets:    
Administrative expense 0 0
Return on plan assets (excluding amounts included in net interest expense) 0 0
Fair value of plan assets 0 0
Defined benefit (obligation) (279) (262)
Net defined benefit liability (asset) - ending balance 279 262
Present value of defined benefit obligation    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance 3,720 3,929
Change in defined benefit obligations:    
Current service cost 57 59
Interest income (cost) (133) (127)
Actuarial losses (gains) 380 (264)
Benefits paid (172) (195)
Settlement losses (gains) 1 0
Plan amendments 0 (1)
Foreign exchange rate movement (35) 65
Change in plan assets:    
Net defined benefit liability (asset) - ending balance 4,084 3,720
Present value of defined benefit obligation | Pension    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance 3,458 3,661
Change in defined benefit obligations:    
Current service cost 52 54
Interest income (cost) (123) (118)
Actuarial losses (gains) 360 (253)
Benefits paid (158) (180)
Settlement losses (gains) 1 0
Plan amendments 0 (1)
Foreign exchange rate movement (31) 59
Change in plan assets:    
Net defined benefit liability (asset) - ending balance 3,805 3,458
Present value of defined benefit obligation | Other post-retirement    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance 262 268
Change in defined benefit obligations:    
Current service cost 5 5
Interest income (cost) (10) (9)
Actuarial losses (gains) 20 (11)
Benefits paid (14) (15)
Settlement losses (gains) 0 0
Plan amendments 0 0
Foreign exchange rate movement (4) 6
Change in plan assets:    
Net defined benefit liability (asset) - ending balance 279 262
Plan assets    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance (3,253) (3,301)
Change in defined benefit obligations:    
Interest income (cost) 115 105
Benefits paid (172) (195)
Foreign exchange rate movement (30) 57
Change in plan assets:    
Administrative expense (1) (1)
Return on plan assets (excluding amounts included in net interest expense) 306 (156)
Employer contributions 125 142
Net defined benefit liability (asset) - ending balance (3,596) (3,253)
Plan assets | Pension    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance (3,253) (3,301)
Change in defined benefit obligations:    
Interest income (cost) 115 105
Benefits paid (158) (180)
Foreign exchange rate movement (30) 57
Change in plan assets:    
Administrative expense (1) (1)
Return on plan assets (excluding amounts included in net interest expense) 306 (156)
Employer contributions 111 127
Net defined benefit liability (asset) - ending balance (3,596) (3,253)
Plan assets | Other post-retirement    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance 0 0
Change in defined benefit obligations:    
Interest income (cost) 0 0
Benefits paid (14) (15)
Foreign exchange rate movement 0 0
Change in plan assets:    
Administrative expense 0 0
Return on plan assets (excluding amounts included in net interest expense) 0 0
Employer contributions 14 15
Net defined benefit liability (asset) - ending balance $ 0 $ 0