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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
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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 | 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

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