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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
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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

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