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Risk Management Activities - Maturity (Details) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial liabilities [line items]    
Accounts payable and accrued liabilities CAD 595 CAD 413
Borrowings 3,707 4,361
Finance lease liabilities 69 73
Dividends payable (Note 23) 34 CAD 54
Liabilities 4,944  
Within one year    
Disclosure of financial liabilities [line items]    
Liabilities 1,436  
2019    
Disclosure of financial liabilities [line items]    
Liabilities 544  
2020    
Disclosure of financial liabilities [line items]    
Liabilities 522  
2021    
Disclosure of financial liabilities [line items]    
Liabilities 107  
2022    
Disclosure of financial liabilities [line items]    
Liabilities 577  
More than five years    
Disclosure of financial liabilities [line items]    
Liabilities 1,758  
Gross carrying amount    
Disclosure of financial liabilities [line items]    
Accounts payable and accrued liabilities 595  
Borrowings 3,664  
Derivative financial liabilities (34)  
Finance lease liabilities 69  
Interest income on debt instruments held 1,344  
Dividends payable (Note 23) 34  
Gross carrying amount | Within one year    
Disclosure of financial liabilities [line items]    
Accounts payable and accrued liabilities 595  
Borrowings 730  
Derivative financial liabilities (37)  
Finance lease liabilities 18  
Interest income on debt instruments held 177  
Dividends payable (Note 23) 34  
Gross carrying amount | 2019    
Disclosure of financial liabilities [line items]    
Accounts payable and accrued liabilities 0  
Borrowings 469  
Derivative financial liabilities 1  
Finance lease liabilities 15  
Interest income on debt instruments held 153  
Dividends payable (Note 23) 0  
Gross carrying amount | 2020    
Disclosure of financial liabilities [line items]    
Accounts payable and accrued liabilities 0  
Borrowings 472  
Derivative financial liabilities 1  
Finance lease liabilities 12  
Interest income on debt instruments held 125  
Dividends payable (Note 23) 0  
Gross carrying amount | 2021    
Disclosure of financial liabilities [line items]    
Accounts payable and accrued liabilities 0  
Borrowings 100  
Derivative financial liabilities 1  
Finance lease liabilities 6  
Interest income on debt instruments held 102  
Dividends payable (Note 23) 0  
Gross carrying amount | 2022    
Disclosure of financial liabilities [line items]    
Accounts payable and accrued liabilities 0  
Borrowings 581  
Derivative financial liabilities 0  
Finance lease liabilities 4  
Interest income on debt instruments held 95  
Dividends payable (Note 23) 0  
Gross carrying amount | More than five years    
Disclosure of financial liabilities [line items]    
Accounts payable and accrued liabilities 0  
Borrowings 1,312  
Derivative financial liabilities 0  
Finance lease liabilities 14  
Interest income on debt instruments held 692  
Dividends payable (Note 23) 0  
Commodity risk management | Gross carrying amount    
Disclosure of financial liabilities [line items]    
Derivative financial liabilities (728)  
Commodity risk management | Gross carrying amount | Within one year    
Disclosure of financial liabilities [line items]    
Derivative financial liabilities (81)  
Commodity risk management | Gross carrying amount | 2019    
Disclosure of financial liabilities [line items]    
Derivative financial liabilities (94)  
Commodity risk management | Gross carrying amount | 2020    
Disclosure of financial liabilities [line items]    
Derivative financial liabilities (88)  
Commodity risk management | Gross carrying amount | 2021    
Disclosure of financial liabilities [line items]    
Derivative financial liabilities (102)  
Commodity risk management | Gross carrying amount | 2022    
Disclosure of financial liabilities [line items]    
Derivative financial liabilities (103)  
Commodity risk management | Gross carrying amount | More than five years    
Disclosure of financial liabilities [line items]    
Derivative financial liabilities CAD (260)