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Risk Management Activities - Effect of Hedges (Details)
MWh in Thousands, $ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2022
USD ($)
MWh
Dec. 31, 2022
CAD ($)
MWh
Dec. 31, 2021
USD ($)
MWh
Dec. 31, 2021
CAD ($)
MWh
Disclosure of detailed information about hedging instruments [line items]            
Fair value asset       $ 3   $ 2
Physical power sales | Cash flow hedges | Commodity risk management            
Disclosure of detailed information about hedging instruments [line items]            
Notional amount (MMWH) | MWh     9,295 9,295 12,624 12,624
Fair value asset           $ 285
Fair value liability       $ (347)    
Change in fair value used for measuring ineffectiveness $ (594) $ (181)        
Interest rate swap | Cash flow hedges | Interest rate risk | USD            
Disclosure of detailed information about hedging instruments [line items]            
Notional amount         $ 300  
Fair value asset           3
Change in fair value used for measuring ineffectiveness   3        
Foreign-Denominated Expenditures | Cash flow hedges | Interest rate risk | USD | Minimum            
Disclosure of detailed information about hedging instruments [line items]            
Notional amount         8  
Fair value asset           0
Change in fair value used for measuring ineffectiveness   0        
Foreign-Denominated Expenditures | Cash flow hedges | Interest rate risk | USD | Maximum            
Disclosure of detailed information about hedging instruments [line items]            
Notional amount         14  
Fair value asset           0
Change in fair value used for measuring ineffectiveness   0        
Foreign-denominated debt | Net Investment Hedge | Currency risk            
Disclosure of detailed information about hedging instruments [line items]            
Fair value asset       $ 502   $ 473
Change in fair value used for measuring ineffectiveness $ 0 $ 0        
Foreign-denominated debt | Net Investment Hedge | Currency risk | USD            
Disclosure of detailed information about hedging instruments [line items]            
Notional amount     $ 370   $ 370