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Fair Value Measurements (Schedule of Valuation Process and Unobservable Inputs) (Details) - Power $ in Millions | Dec. 31, 2024 USD ($) $ / MWh | Dec. 31, 2023 USD ($) $ / MWh
--- | --- | ---
Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative assets | $ | $ 6 | $ 5
Derivative Liability | $ | $ (53) | $ (69)
Measurement Input, Commodity Forward Price | Minimum | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | 32 | 31
Measurement Input, Commodity Forward Price | Maximum | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | 69 | 65
Measurement Input, Commodity Forward Price | Weighted Average | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | 45 | 43
Measurement Input, Nodal Basis | Minimum | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | (8) | (8)
Measurement Input, Nodal Basis | Maximum | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | (2) | (1)
Measurement Input, Nodal Basis | Weighted Average | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | (5) | (5)

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