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Risk Management Activities - Commodity Derivative Instruments Not Designated as Hedging Instruments (Details) - Non-hedge - Commodity risk management
Dec. 31, 2023
MWh
J
t
Dec. 31, 2022
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 54,043,000 55,821,000
Notional amount purchased 12,628,000 13,934,000
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 50,949,000 23,464,000
Notional amount purchased | J 209,348,000 162,384,000
Transmission    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional amount sold 0 0
Notional amount purchased 856,000 1,643,000
Emissions    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional amount sold 212,000 274,000
Notional amount purchased 804,000 2,297,000
Notional amount sold | t 4,450,000 300,000
Notional amount purchased | t 5,125,000 300,000
Coal    
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 5,172,000 7,746,000