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Risk Management Activities - Additional Information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Current non-cash assets pledged as collateral for which transferee has right by contract or custom to sell or repledge collateral $ 49,000,000 $ 42,000,000      
Financial assets pledged as collateral for liabilities or contingent liabilities 0 3,000,000      
Derivative, contingent feature, additional collateral requirement 85,000,000 $ 51,000,000      
Asset-backed debt instruments held 631,000,000        
Debt instruments held $ 1,000,000,000        
Borrowings subject to floating interest rates 7.00% 11.00%   7.00% 11.00%
Sensitivity analysis used by management for the foreign exchange differences from functional currency $ 0.03 $ 0.03 $ 0.04    
Borrowings $ 3,361,000,000 3,212,000,000      
Bond, interest rate 5.75%        
Target percentage of hedged forecasted foreign operating cash flows over four year period 60.00%        
Target percentage of hedged forecasted foreign operating cash flows, current period 90.00%        
Target percentage of hedged forecasted foreign operating cash flows, next year 70.00%        
Target percentage of hedged forecasted foreign operating cash flows, third year 50.00%        
Target percentage of hedged forecasted foreign operating cash flows, fourth year 30.00%        
Change in foreign exchange rates $ 0 0 5,000,000    
Maximum exposure to credit risk 22,000,000 5,000,000      
Other comprehensive income that will be reclassified to profit or loss, net of tax (90,000,000) (19,000,000) (11,000,000)    
Gains (losses) on change in fair value of derivatives 43,000,000 33,000,000 (29,000,000)    
Gains on change in fair value of derivatives 11,000,000 24,000,000 3,000,000    
Unrealised loss on change in fair value of derivatives 2,000,000        
Unrealised gains on change in fair value of derivatives   6,000,000 4,000,000    
Net realized gains on change in fair value of derivatives 13,000,000 18,000,000      
Net realized losses on change in fair value of derivatives     1,000,000    
Unrealized pre-tax gains (losses) 1,000,000 1,000,000 4,000,000    
Within one year          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Other comprehensive income that will be reclassified to profit or loss, net of tax 72,000,000        
Long-term debt | Net investment hedges          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Notional amount       $ 370 $ 370
Forward contract          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Notional amount $ 150,000,000        
Bond, forward yield 1.20%        
Bond Lock Agreement [Member]          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Notional amount $ 75,000,000        
Commodity Price Risk - Proprietary Trading [Member]          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Value at risk 1,000,000 1,000,000 2,000,000    
Commodity Price Risk - Generation [Member]          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Value at risk 12,000,000 25,000,000 18,000,000    
Commodity Price Risk - Generation - Mark To Market Value [Member]          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Value at risk 15,000,000 8,000,000 $ 13,000,000    
Interest rate risk | Interest Rate Exposure [Member]          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Borrowings $ 150,000,000        
Interest rate risk | Interest rate swap          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Notional amount       150  
Borrowings       $ 400  
Interest rate risk | Interest rate swap | Fixed interest rate [member]          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Derivate, fixed interest rate 0.94%        
Letter of credit          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Collateral posted on derivative liabilities $ 163,000,000 $ 112,000,000