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Credit Facilities, Long-Term Debt, and Finance Lease Obligations - Principal Repayments (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]      
Borrowings $ 3,212   $ 3,267
Finance lease liabilities   $ 32  
Gross carrying amount      
Disclosure of detailed information about borrowings [line items]      
Borrowings 3,104    
Finance lease liabilities 142    
Gross carrying amount | 2020      
Disclosure of detailed information about borrowings [line items]      
Borrowings 494    
Finance lease liabilities 19    
Gross carrying amount | 2021      
Disclosure of detailed information about borrowings [line items]      
Borrowings 98    
Finance lease liabilities 14    
Gross carrying amount | 2022      
Disclosure of detailed information about borrowings [line items]      
Borrowings 625    
Finance lease liabilities 9    
Gross carrying amount | 2023      
Disclosure of detailed information about borrowings [line items]      
Borrowings 372    
Finance lease liabilities 6    
Gross carrying amount | 2024      
Disclosure of detailed information about borrowings [line items]      
Borrowings 105    
Finance lease liabilities 4    
Gross carrying amount | 2025      
Disclosure of detailed information about borrowings [line items]      
Borrowings 1,410    
Finance lease liabilities $ 90