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Fair Value (Unobservable Inputs related to Level 3 Assets and Liabilities) (Details) $ in Millions | Dec. 31, 2023 USD ($) $ / MWh $ / MMBTU | Dec. 31, 2022 USD ($) $ / MWh $ / MMBTU
--- | --- | ---
Unobservable Input Valuation Techniques [Line Items] |  |
Derivative Assets | $ 1,197 | $ 1,922
Derivative Liabilities | (1,172) | (2,169)
Natural Gas |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Derivative Assets | 637 | 744
Derivative Liabilities | (615) | (1,018)
Electricity |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Derivative Assets | 421 | 963
Derivative Liabilities | $ (388) | $ (935)
Level 3 | Discounted Cash Flow | Forward basis price | Natural Gas | Minimum |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Forward basis price | $ / MMBTU | (1.57) | (1.91)
Level 3 | Discounted Cash Flow | Forward basis price | Natural Gas | Maximum |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Forward basis price | $ / MMBTU | 6.27 | 39.94
Level 3 | Discounted Cash Flow | Forward basis price | Natural Gas | Weighted Average |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Forward basis price | $ / MMBTU | (0.08) | 0.18
Level 3 | Discounted Cash Flow | Forward basis price | Electricity | Minimum |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Forward basis price | $ / MWh | (18.49) | (29.41)
Level 3 | Discounted Cash Flow | Forward basis price | Electricity | Maximum |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Forward basis price | $ / MWh | 15.47 | 15.00
Level 3 | Discounted Cash Flow | Forward basis price | Electricity | Weighted Average |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Forward basis price | $ / MWh | (3.99) | (3.04)
Recurring | Level 3 |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Derivative Assets | $ 350 | $ 390
Recurring | Level 3 | Natural Gas |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Derivative Assets | 179 | 135
Derivative Liabilities | (157) | (390)
Recurring | Level 3 | Electricity |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Derivative Assets | 163 | 243
Derivative Liabilities | $ (116) | $ (276)

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