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Credit Facilities, Long-Term Debt, and Finance Lease Obligations - Finance Lease Obligations (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of finance lease and operating lease by lessee [line items]    
Minimum lease payments $ 70 $ 78
Present value of minimum lease payments 63 69
Less: interest costs 7 9
Total finance lease obligations 63 69
Current portion of finance lease obligations 18 18
Long-term portion of finance lease obligations 45 51
Within one year    
Disclosure of finance lease and operating lease by lessee [line items]    
Minimum lease payments 21 20
Present value of minimum lease payments 20 20
Second to fifth years inclusive    
Disclosure of finance lease and operating lease by lessee [line items]    
Minimum lease payments 39 43
Present value of minimum lease payments 35 38
More than five years    
Disclosure of finance lease and operating lease by lessee [line items]    
Minimum lease payments 10 15
Present value of minimum lease payments $ 8 $ 11