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Risk Management, Derivative Instruments and Hedging Activities - Schedule of Net Notional Volumes of Open Commodity Derivatives and Interest Rate Derivatives (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2025 MWh MMBTU T | Jun. 30, 2025 USD ($) MMBTU MWh T | Dec. 31, 2024 USD ($)
Commodity derivatives | Short |  |  |
Derivative [Line Items] |  |  |
Commodity purchase (sales) derivatives, power and natural gas | MWh | 38,615,192 | 54,076,474 |
Commodity derivatives | Long |  |  |
Derivative [Line Items] |  |  |
Commodity purchase (sales) derivatives, power and natural gas | MMBTU | 32,405,460 | 119,609,740 |
Commodity purchase (sales) derivatives, emission allowances | T | 100,000 | 0 |
Interest rate derivatives |  |  |
Derivative [Line Items] |  |  |
Interest rate (in millions) | $ |  | $ 990 | $ 290

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