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Commodity and Other Derivative Contractual Assets and Liabilities - Schedule of Notional Amounts of Outstanding Derivative Positions (Details) gal in Millions, certificate in Millions, T in Millions, MMBTU in Millions, $ in Millions | Dec. 31, 2023 USD ($) GWh certificate T MMBTU gal | Dec. 31, 2022 USD ($) MMBTU GWh certificate gal T
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Natural gas |  |
Derivatives, Fair Value [Line Items] |  |
Notional Volume | MMBTU | 5,335 | 6,007
Electricity |  |
Derivatives, Fair Value [Line Items] |  |
Notional Volume | GWh | 800,001 | 754,762
Financial transmission rights |  |
Derivatives, Fair Value [Line Items] |  |
Notional Volume | GWh | 250,895 | 225,845
Coal |  |
Derivatives, Fair Value [Line Items] |  |
Notional Volume | T | 35 | 48
Fuel oil |  |
Derivatives, Fair Value [Line Items] |  |
Notional Volume | gal | 3 | 105
Emissions |  |
Derivatives, Fair Value [Line Items] |  |
Notional Volume | T | 24 | 40
Renewable energy certificates |  |
Derivatives, Fair Value [Line Items] |  |
Notional Volume | certificate | 29 | 31
Interest rate swaps, variable/fixed |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ | $ 5,225 | $ 6,720
Interest rate swaps, fixed/variable |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ | $ 1,300 | $ 2,120

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