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Risk Management Activities - Commodity Derivative Instruments Not Designated as Hedging Instruments (Details) - Non-hedge - Commodity risk management
Dec. 31, 2022
MWh
J
t
Dec. 31, 2021
MWh
J
t
Electricity    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional amount sold 55,821,000 46,139,000
Notional amount purchased 13,934,000 14,951,000
Natural gas (GJ)    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional amount sold | J 23,464,000 7,501,000
Notional amount purchased | J 162,384,000 173,898,000
Transmission (MWh)    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional amount sold 0 37,000
Notional amount purchased 1,643,000 1,097,000
Emissions    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional amount sold 274,000 445,000
Notional amount purchased 2,297,000 2,030,000
Notional amount sold | t 300,000 350,000
Notional amount purchased | t 300,000 350,000
Coal (tonnes)    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional amount sold | t 0 0
Notional amount purchased | t 7,746,000 9,352,000