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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, 2020
Dec. 31, 2019
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance $ 488  
Change in defined benefit obligations:    
Current service cost 64 $ 57
Interest income (cost) (17) (18)
Curtailment losses (gains) 0 1
Settlements 2 0
Foreign exchange rate movement 2 6
Change in plan assets:    
Administrative expense (1) (1)
Return on plan assets (excluding amounts included in net interest expense) 305 306
Fair value of plan assets 3,909 3,596
Defined benefit (obligation) (4,337) (4,084)
Net defined benefit liability (asset) - ending balance 428 488
Pension    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance 209  
Change in defined benefit obligations:    
Current service cost 58 52
Interest income (cost) (8) (8)
Curtailment losses (gains) 0 1
Settlements 2 0
Foreign exchange rate movement 0 2
Change in plan assets:    
Administrative expense (1) (1)
Return on plan assets (excluding amounts included in net interest expense) 305 306
Fair value of plan assets 3,909 3,596
Defined benefit (obligation) (4,060) (3,805)
Net defined benefit liability (asset) - ending balance 151 209
Other post-retirement    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance 279  
Change in defined benefit obligations:    
Current service cost 6 5
Interest income (cost) (9) (10)
Curtailment losses (gains) 0 0
Settlements 0 0
Foreign exchange rate movement 2 4
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) (277) (279)
Net defined benefit liability (asset) - ending balance 277 279
Present value of defined benefit obligation    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance 4,084 3,720
Change in defined benefit obligations:    
Current service cost 64 57
Interest income (cost) (119) (133)
Actuarial losses (gains) 277 380
Benefits paid (198) (172)
Curtailment losses (gains) 0 1
Settlements (5) 0
Foreign exchange rate movement (4) (35)
Change in plan assets:    
Net defined benefit liability (asset) - ending balance 4,337 4,084
Present value of defined benefit obligation | Pension    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance 3,805 3,458
Change in defined benefit obligations:    
Current service cost 58 52
Interest income (cost) (110) (123)
Actuarial losses (gains) 278 360
Benefits paid (184) (158)
Curtailment losses (gains) 0 1
Settlements (5) 0
Foreign exchange rate movement (2) (31)
Change in plan assets:    
Net defined benefit liability (asset) - ending balance 4,060 3,805
Present value of defined benefit obligation | Other post-retirement    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance 279 262
Change in defined benefit obligations:    
Current service cost 6 5
Interest income (cost) (9) (10)
Actuarial losses (gains) (1) 20
Benefits paid (14) (14)
Curtailment losses (gains) 0 0
Settlements 0 0
Foreign exchange rate movement (2) (4)
Change in plan assets:    
Net defined benefit liability (asset) - ending balance 277 279
Plan assets    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance (3,596) (3,253)
Change in defined benefit obligations:    
Interest income (cost) 102 115
Benefits paid (198) (172)
Settlements (7) 0
Foreign exchange rate movement 1 (30)
Change in plan assets:    
Administrative expense (1) (1)
Return on plan assets (excluding amounts included in net interest expense) 305 306
Employer contributions 111 125
Net defined benefit liability (asset) - ending balance (3,909) (3,596)
Plan assets | Pension    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability (asset) - beginning balance (3,596) (3,253)
Change in defined benefit obligations:    
Interest income (cost) 102 115
Benefits paid (184) (158)
Settlements (7) 0
Foreign exchange rate movement 1 (30)
Change in plan assets:    
Administrative expense (1) (1)
Return on plan assets (excluding amounts included in net interest expense) 305 306
Employer contributions 97 111
Net defined benefit liability (asset) - ending balance (3,909) (3,596)
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) (14)
Settlements 0 0
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 14
Net defined benefit liability (asset) - ending balance $ 0 $ 0