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v3.25.1

Fair Value (Unobservable Inputs related to Level 3 Assets and Liabilities) (Details) $ in Millions | Mar. 31, 2025 USD ($) $ / MWh $ / MMBTU | Dec. 31, 2024 USD ($) $ / MMBTU $ / MWh
--- | --- | ---
Unobservable Inputs Valuation Techniques [Line Items] |  |
Derivative Assets | $ 837 | $ 694
Derivative Liabilities | (758) | (605)
Natural gas |  |
Unobservable Inputs Valuation Techniques [Line Items] |  |
Derivative Assets | 461 | 428
Derivative Liabilities | (395) | (410)
Electricity |  |
Unobservable Inputs Valuation Techniques [Line Items] |  |
Derivative Assets | 304 | 187
Derivative Liabilities | $ (310) | $ (150)
Level 3 | Natural gas | Forward basis price | Minimum | Discounted Cash Flow |  |
Unobservable Inputs Valuation Techniques [Line Items] |  |
Forward basis price | $ / MMBTU | (1.36) | (1.24)
Level 3 | Natural gas | Forward basis price | Maximum | Discounted Cash Flow |  |
Unobservable Inputs Valuation Techniques [Line Items] |  |
Forward basis price | $ / MMBTU | 2.52 | 9.96
Level 3 | Natural gas | Forward basis price | Weighted Average | Discounted Cash Flow |  |
Unobservable Inputs Valuation Techniques [Line Items] |  |
Forward basis price | $ / MMBTU | (0.04) | (0.05)
Level 3 | Electricity | Forward basis price | Minimum | Discounted Cash Flow |  |
Unobservable Inputs Valuation Techniques [Line Items] |  |
Forward basis price | $ / MWh | (17.35) | (16.34)
Level 3 | Electricity | Forward basis price | Maximum | Discounted Cash Flow |  |
Unobservable Inputs Valuation Techniques [Line Items] |  |
Forward basis price | $ / MWh | 18.38 | 17.28
Level 3 | Electricity | Forward basis price | Weighted Average | Discounted Cash Flow |  |
Unobservable Inputs Valuation Techniques [Line Items] |  |
Forward basis price | $ / MWh | (4.30) | (2.74)
Recurring | Level 3 |  |
Unobservable Inputs Valuation Techniques [Line Items] |  |
Derivative Assets | $ 114 | $ 166
Recurring | Level 3 | Natural gas |  |
Unobservable Inputs Valuation Techniques [Line Items] |  |
Derivative Assets | 98 | 105
Derivative Liabilities | (98) | (123)
Recurring | Level 3 | Electricity |  |
Unobservable Inputs Valuation Techniques [Line Items] |  |
Derivative Assets | 13 | 51
Derivative Liabilities | $ (104) | $ (27)

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