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Risk Management Activities - Maturity Analysis of Financial Liabilities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Accounts payable and accrued liabilities $ 599 $ 413
Borrowings 3,361 3,212
Exchangeable securities 730 326
Dividends payable 59 $ 37
Liabilities 6,051  
Within one year    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Liabilities 885  
Lease commitments for short-term leases for which recognition exemption has been used 13  
2022    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Liabilities 750  
2023    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Liabilities 331  
2024    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Liabilities 162  
2025    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Liabilities 901  
More than five years    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Liabilities 3,022  
Gross carrying amount    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Accounts payable and accrued liabilities 599  
Borrowings 3,264  
Exchangeable securities 750  
Derivative financial assets (12)  
Lease liabilities 134  
Interest expense on borrowings 1,565  
Dividends payable 59  
Gross carrying amount | 7% Unsecured Subordinated Debentures Due May 1, 2039    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 210  
Gross carrying amount | Commodity risk management    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities (542)  
Gross carrying amount | Within one year    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Accounts payable and accrued liabilities 599  
Borrowings 96  
Exchangeable securities 0  
Derivative financial assets (14)  
Lease liabilities (5)  
Interest expense on borrowings 161  
Dividends payable 59  
Gross carrying amount | Within one year | 7% Unsecured Subordinated Debentures Due May 1, 2039    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 53  
Gross carrying amount | Within one year | Commodity risk management    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities (92)  
Gross carrying amount | 2022    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Accounts payable and accrued liabilities 0  
Borrowings 626  
Exchangeable securities 0  
Derivative financial assets 0  
Lease liabilities 6  
Interest expense on borrowings 153  
Dividends payable 0  
Gross carrying amount | 2022 | 7% Unsecured Subordinated Debentures Due May 1, 2039    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 52  
Gross carrying amount | 2022 | Commodity risk management    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities (87)  
Gross carrying amount | 2023    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Accounts payable and accrued liabilities 0  
Borrowings 277  
Exchangeable securities 0  
Derivative financial assets (1)  
Lease liabilities 5  
Interest expense on borrowings 126  
Dividends payable 0  
Gross carrying amount | 2023 | 7% Unsecured Subordinated Debentures Due May 1, 2039    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 53  
Gross carrying amount | 2023 | Commodity risk management    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities (131)  
Gross carrying amount | 2024    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Accounts payable and accrued liabilities 0  
Borrowings 119  
Exchangeable securities 0  
Derivative financial liabilities (2)  
Lease liabilities 5  
Interest expense on borrowings 119  
Dividends payable 0  
Gross carrying amount | 2024 | 7% Unsecured Subordinated Debentures Due May 1, 2039    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 52  
Gross carrying amount | 2024 | Commodity risk management    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities (131)  
Gross carrying amount | 2025    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Accounts payable and accrued liabilities 0  
Borrowings 136  
Exchangeable securities 750  
Derivative financial assets 0  
Lease liabilities 5  
Interest expense on borrowings 113  
Dividends payable 0  
Gross carrying amount | 2025 | 7% Unsecured Subordinated Debentures Due May 1, 2039    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 0  
Gross carrying amount | 2025 | Commodity risk management    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities (103)  
Gross carrying amount | More than five years    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Accounts payable and accrued liabilities 0  
Borrowings 2,010  
Exchangeable securities 0  
Derivative financial liabilities (1)  
Lease liabilities 118  
Interest expense on borrowings 893  
Dividends payable 0  
Gross carrying amount | More than five years | 7% Unsecured Subordinated Debentures Due May 1, 2039    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 0  
Gross carrying amount | More than five years | Commodity risk management    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial assets $ (2)