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Fair Value (Unobservable Inputs related to Level 3 Assets and Liabilities) (Details) $ in Millions | Dec. 31, 2024 USD ($) $ / MWh $ / MMBTU | Dec. 31, 2023 USD ($) $ / MMBTU $ / MWh
--- | --- | ---
Unobservable Input Valuation Techniques [Line Items] |  |
Derivative Assets | $ 694 | $ 1,197
Derivative Liabilities | (605) | (1,172)
Natural Gas |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Derivative Assets | 428 | 637
Derivative Liabilities | (410) | (615)
Electricity |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Derivative Assets | 187 | 421
Derivative Liabilities | $ (150) | $ (388)
Level 3 | Discounted Cash Flow | Forward basis price | Natural Gas | Minimum |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Forward basis price | $ / MMBTU | (1.24) | (1.57)
Level 3 | Discounted Cash Flow | Forward basis price | Natural Gas | Maximum |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Forward basis price | $ / MMBTU | 9.96 | 6.27
Level 3 | Discounted Cash Flow | Forward basis price | Natural Gas | Weighted Average |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Forward basis price | $ / MMBTU | (0.05) | (0.08)
Level 3 | Discounted Cash Flow | Forward basis price | Electricity | Minimum |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Forward basis price | $ / MWh | (16.34) | (18.49)
Level 3 | Discounted Cash Flow | Forward basis price | Electricity | Maximum |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Forward basis price | $ / MWh | 17.28 | 15.47
Level 3 | Discounted Cash Flow | Forward basis price | Electricity | Weighted Average |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Forward basis price | $ / MWh | (2.74) | (3.99)
Recurring | Level 3 |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Derivative Assets | $ 166 | $ 350
Recurring | Level 3 | Natural Gas |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Derivative Assets | 105 | 179
Derivative Liabilities | (123) | (157)
Recurring | Level 3 | Electricity |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Derivative Assets | 51 | 163
Derivative Liabilities | $ (27) | $ (116)

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