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Risk Management Activities - Commodity derivative instruments not designated as hedging instruments (Details) - Non-Hedges - Commodity risk management
Dec. 31, 2021
MWh
J
t
Dec. 31, 2020
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 46,139,000 12,944,000
Notional amount purchased 14,951,000 8,258,000
Natural gas    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional amount sold | J 7,501,000 23,035,000
Notional amount purchased | J 173,898,000 177,448,000
Transmission    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional amount sold 37,000 0
Notional amount purchased 1,097,000 1,578,000
Emissions    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional amount sold 445,000 1,831,000
Notional amount purchased 2,030,000 2,112,000
Notional amount sold | t 350,000 2,160,000
Notional amount purchased | t 350,000 2,365,000