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Pension Plans and Other Post-Retirement Benefits - Schedule of Net Benefit Expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of defined benefit plans [line items]    
Current service cost $ 64 $ 57
Administrative expense 1 1
Net interest expense (income) 17 18
Curtailment losses (gains) 0 1
Settlements 2 0
Other long-term employee benefit losses (gains) 0 5
Net benefit expense 84 82
Pension    
Disclosure of defined benefit plans [line items]    
Current service cost 58 52
Administrative expense 1 1
Net interest expense (income) 8 8
Curtailment losses (gains) 0 1
Settlements 2 0
Other long-term employee benefit losses (gains) 0 0
Net benefit expense 69 62
Other post-retirement    
Disclosure of defined benefit plans [line items]    
Current service cost 6 5
Administrative expense 0 0
Net interest expense (income) 9 10
Curtailment losses (gains) 0 0
Settlements 0 0
Other long-term employee benefit losses (gains) 0 5
Net benefit expense $ 15 $ 20