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Fair Value (Unobservable Inputs related to Level 3 Assets and Liabilities) (Details) $ in Millions | Mar. 31, 2024 USD ($) $ / MMBTU $ / MWh | Dec. 31, 2023 USD ($) $ / MMBTU $ / MWh
--- | --- | ---
Unobservable Inputs Valuation Techniques [Line Items] |  |
Derivative Assets | $ 891 | $ 1,197
Derivative Liabilities | (935) | (1,172)
Natural gas |  |
Unobservable Inputs Valuation Techniques [Line Items] |  |
Derivative Assets | 499 | 637
Derivative Liabilities | (506) | (615)
Electricity |  |
Unobservable Inputs Valuation Techniques [Line Items] |  |
Derivative Assets | 235 | 421
Derivative Liabilities | $ (267) | $ (388)
Level 3 | Natural gas | Forward basis price | Minimum | Discounted Cash Flow |  |
Unobservable Inputs Valuation Techniques [Line Items] |  |
Forward basis price | $ / MMBTU | (1.27) | (1.57)
Level 3 | Natural gas | Forward basis price | Maximum | Discounted Cash Flow |  |
Unobservable Inputs Valuation Techniques [Line Items] |  |
Forward basis price | $ / MMBTU | 2.42 | 6.27
Level 3 | Natural gas | Forward basis price | Weighted Average | Discounted Cash Flow |  |
Unobservable Inputs Valuation Techniques [Line Items] |  |
Forward basis price | $ / MMBTU | (0.09) | (0.08)
Level 3 | Electricity | Forward basis price | Minimum | Discounted Cash Flow |  |
Unobservable Inputs Valuation Techniques [Line Items] |  |
Forward basis price | $ / MWh | (18.83) | (18.49)
Level 3 | Electricity | Forward basis price | Maximum | Discounted Cash Flow |  |
Unobservable Inputs Valuation Techniques [Line Items] |  |
Forward basis price | $ / MWh | 11.90 | 15.47
Level 3 | Electricity | Forward basis price | Weighted Average | Discounted Cash Flow |  |
Unobservable Inputs Valuation Techniques [Line Items] |  |
Forward basis price | $ / MWh | (4.53) | (3.99)
Recurring | Level 3 |  |
Unobservable Inputs Valuation Techniques [Line Items] |  |
Derivative Assets | $ 200 | $ 350
Recurring | Level 3 | Natural gas |  |
Unobservable Inputs Valuation Techniques [Line Items] |  |
Derivative Assets | 119 | 179
Derivative Liabilities | (122) | (157)
Recurring | Level 3 | Electricity |  |
Unobservable Inputs Valuation Techniques [Line Items] |  |
Derivative Assets | 77 | 163
Derivative Liabilities | $ (102) | $ (116)

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