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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, 2019
Dec. 31, 2018
Disclosure of defined benefit plans [line items]    
Current service cost $ 57 $ 59
Net interest expense (income) 18 22
Curtailment losses (gains) 1 0
Plan amendments 0 (1)
Other long-term employee benefit losses (gains) 5 (3)
Net benefit expense 82 78
Pension    
Disclosure of defined benefit plans [line items]    
Current service cost 52 54
Net interest expense (income) 8 13
Curtailment losses (gains) 1 0
Plan amendments 0 (1)
Other long-term employee benefit losses (gains) 0 0
Net benefit expense 62 67
Other post-retirement    
Disclosure of defined benefit plans [line items]    
Current service cost 5 5
Net interest expense (income) 10 9
Curtailment losses (gains) 0 0
Plan amendments 0 0
Other long-term employee benefit losses (gains) 5 (3)
Net benefit expense $ 20 $ 11