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Fair Value (Unobservable Inputs related to Level 3 Assets and Liabilities) (Details) $ in Millions | Dec. 31, 2022 USD ($) $ / MMBTU $ / MWh | Dec. 31, 2021 USD ($) $ / MMBTU $ / MWh
--- | --- | ---
Unobservable Input Valuation Techniques [Line Items] |  |
Derivative Assets | $ 1,922 | $ 1,391
Derivative Liabilities | (2,169) | (1,508)
Natural Gas |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Derivative Assets | 744 | 454
Derivative Liabilities | (1,018) | (594)
Electricity |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Derivative Assets | 963 | 643
Derivative Liabilities | $ (935) | $ (622)
Level 3 | Discounted Cash Flow | Forward basis price | Natural Gas | Minimum |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Forward basis price | $ / MMBTU | (1.91) | (1.36)
Level 3 | Discounted Cash Flow | Forward basis price | Natural Gas | Maximum |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Forward basis price | $ / MMBTU | 39.94 | 3.82
Level 3 | Discounted Cash Flow | Forward basis price | Natural Gas | Weighted Average |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Forward basis price | $ / MMBTU | 0.18 | (0.04)
Level 3 | Discounted Cash Flow | Forward basis price | Electricity | Minimum |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Forward basis price | $ / MWh | (29.41) | (11.70)
Level 3 | Discounted Cash Flow | Forward basis price | Electricity | Maximum |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Forward basis price | $ / MWh | 15.00 | 6.65
Level 3 | Discounted Cash Flow | Forward basis price | Electricity | Weighted Average |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Forward basis price | $ / MWh | (3.04) | (2.01)
Recurring | Level 3 |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Derivative Assets | $ 390 | $ 218
Recurring | Level 3 | Natural Gas |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Derivative Assets | 135 | 66
Derivative Liabilities | (390) | (245)
Recurring | Level 3 | Electricity |  |
Unobservable Input Valuation Techniques [Line Items] |  |
Derivative Assets | 243 | 143
Derivative Liabilities | $ (276) | $ (188)

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