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Credit Facilities, Long-Term Debt, and Finance Lease Obligations - Principal Repayments (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]    
Borrowings $ 3,267 $ 3,707
Gross carrying amount    
Disclosure of detailed information about borrowings [line items]    
Borrowings 3,234  
Gross carrying amount | 2018    
Disclosure of detailed information about borrowings [line items]    
Borrowings 130  
Gross carrying amount | 2019    
Disclosure of detailed information about borrowings [line items]    
Borrowings 486  
Gross carrying amount | 2020    
Disclosure of detailed information about borrowings [line items]    
Borrowings 91  
Gross carrying amount | 2021    
Disclosure of detailed information about borrowings [line items]    
Borrowings 947  
Gross carrying amount | 2022    
Disclosure of detailed information about borrowings [line items]    
Borrowings 141  
Gross carrying amount | 2023 and thereafter    
Disclosure of detailed information about borrowings [line items]    
Borrowings $ 1,439