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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, 2018
Dec. 31, 2017
Disclosure of defined benefit plans [line items]    
Current service cost $ 59 $ 50
Net interest expense (income) 22 22
Settlement losses (gains)(1) 0 (6)
Plan amendments (1) (2)
Other long-term employee benefit losses (gains) (3) 4
Net benefit expense 78 68
Pension    
Disclosure of defined benefit plans [line items]    
Current service cost 54 47
Net interest expense (income) 13 12
Settlement losses (gains)(1) 0 (6)
Plan amendments (1) (2)
Other long-term employee benefit losses (gains) 0 0
Net benefit expense 67 51
Other post-retirement    
Disclosure of defined benefit plans [line items]    
Current service cost 5 3
Net interest expense (income) 9 10
Settlement losses (gains)(1) 0 0
Plan amendments 0 0
Other long-term employee benefit losses (gains) (3) 4
Net benefit expense $ 11 $ 17