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Risk Management Activities - Maturity (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2019
CAD ($)
MWh
$ / shares
$ / shares
Jan. 01, 2019
CAD ($)
Dec. 31, 2018
CAD ($)
Disclosure of financial liabilities [line items]      
Accounts payable and accrued liabilities $ 413   $ 496
Borrowings 3,212   3,267
Exchangeable securities 326   0
Finance lease liabilities   $ 32  
Dividends payable (Note 24 and 25) 37   $ 58
Liabilities 4,756    
2020      
Disclosure of financial liabilities [line items]      
Liabilities 1,061    
2021      
Disclosure of financial liabilities [line items]      
Liabilities 186    
2022      
Disclosure of financial liabilities [line items]      
Liabilities 638    
2023      
Disclosure of financial liabilities [line items]      
Liabilities 363    
2024      
Disclosure of financial liabilities [line items]      
Liabilities 85    
2025      
Disclosure of financial liabilities [line items]      
Liabilities 2,423    
Gross carrying amount      
Disclosure of financial liabilities [line items]      
Accounts payable and accrued liabilities 413    
Borrowings 3,104    
Exchangeable securities 350    
Derivative financial liabilities (4)    
Finance lease liabilities 142    
Interest income on debt instruments held 1,283    
Interest expense on borrowings 123    
Dividends payable (Note 24 and 25) 37    
Gross carrying amount | 2020      
Disclosure of financial liabilities [line items]      
Accounts payable and accrued liabilities 413    
Borrowings 494    
Exchangeable securities 0    
Derivative financial liabilities 1    
Finance lease liabilities 19    
Interest income on debt instruments held 161    
Interest expense on borrowings 25    
Dividends payable (Note 24 and 25) 37    
Gross carrying amount | 2021      
Disclosure of financial liabilities [line items]      
Accounts payable and accrued liabilities 0    
Borrowings 98    
Exchangeable securities 0    
Derivative financial liabilities 0    
Finance lease liabilities 14    
Interest income on debt instruments held 138    
Interest expense on borrowings 25    
Dividends payable (Note 24 and 25) 0    
Gross carrying amount | 2022      
Disclosure of financial liabilities [line items]      
Accounts payable and accrued liabilities 0    
Borrowings 625    
Exchangeable securities 0    
Derivative financial liabilities (6)    
Finance lease liabilities 9    
Interest income on debt instruments held 128    
Interest expense on borrowings 25    
Dividends payable (Note 24 and 25) 0    
Gross carrying amount | 2023      
Disclosure of financial liabilities [line items]      
Accounts payable and accrued liabilities 0    
Borrowings 372    
Exchangeable securities 0    
Derivative financial liabilities 2    
Finance lease liabilities 6    
Interest income on debt instruments held 98    
Interest expense on borrowings 24    
Dividends payable (Note 24 and 25) 0    
Gross carrying amount | 2024      
Disclosure of financial liabilities [line items]      
Accounts payable and accrued liabilities 0    
Borrowings 105    
Exchangeable securities 0    
Derivative financial liabilities 0    
Finance lease liabilities 4    
Interest income on debt instruments held 87    
Interest expense on borrowings 24    
Dividends payable (Note 24 and 25) 0    
Gross carrying amount | 2025      
Disclosure of financial liabilities [line items]      
Accounts payable and accrued liabilities 0    
Borrowings 1,410    
Exchangeable securities 350    
Derivative financial liabilities (1)    
Finance lease liabilities 90    
Interest income on debt instruments held 671    
Interest expense on borrowings 0    
Dividends payable (Note 24 and 25) 0    
Commodity risk management | Gross carrying amount      
Disclosure of financial liabilities [line items]      
Derivative financial liabilities (692)    
Commodity risk management | Gross carrying amount | 2020      
Disclosure of financial liabilities [line items]      
Derivative financial liabilities (89)    
Commodity risk management | Gross carrying amount | 2021      
Disclosure of financial liabilities [line items]      
Derivative financial liabilities (89)    
Commodity risk management | Gross carrying amount | 2022      
Disclosure of financial liabilities [line items]      
Derivative financial liabilities (143)    
Commodity risk management | Gross carrying amount | 2023      
Disclosure of financial liabilities [line items]      
Derivative financial liabilities (139)    
Commodity risk management | Gross carrying amount | 2024      
Disclosure of financial liabilities [line items]      
Derivative financial liabilities (135)    
Commodity risk management | Gross carrying amount | 2025      
Disclosure of financial liabilities [line items]      
Derivative financial liabilities $ (97)    
Non-Hedges | Electricity | Commodity risk management | 2020      
Disclosure of financial liabilities [line items]      
Notional amount | MWh 3,465,000    
Average Power Prices | $ / shares $ 67.82    
Non-Hedges | Electricity | Commodity risk management | 2021      
Disclosure of financial liabilities [line items]      
Notional amount | MWh 3,424,000    
Average Power Prices | $ / shares $ 71.06    
Non-Hedges | Electricity | Commodity risk management | 2022      
Disclosure of financial liabilities [line items]      
Notional amount | MWh 3,329,000    
Average Power Prices | $ / shares $ 73.55    
Non-Hedges | Electricity | Commodity risk management | 2023      
Disclosure of financial liabilities [line items]      
Notional amount | MWh 3,329,000    
Average Power Prices | $ / shares $ 75.39    
Non-Hedges | Electricity | Commodity risk management | 2024      
Disclosure of financial liabilities [line items]      
Notional amount | MWh 3,338,000    
Average Power Prices | $ / shares $ 77.28    
Non-Hedges | Electricity | Commodity risk management | 2025      
Disclosure of financial liabilities [line items]      
Notional amount | MWh 2,628,000    
Average Power Prices | $ / shares $ 79.20    
Non-Hedges | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Commodity risk management | 2020      
Disclosure of financial liabilities [line items]      
Notional amount | MWh 116,000,000    
Average foreign exchange rate | $ / shares 0.7672    
Non-Hedges | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Commodity risk management | 2021      
Disclosure of financial liabilities [line items]      
Notional amount | MWh 8,000,000    
Average foreign exchange rate | $ / shares 0.7686