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Fair Value Measurements (Schedule Of Valuation Process And Unobservable Inputs) (Details) - Power $ in Millions | Mar. 31, 2024 USD ($) $ / MWh | Dec. 31, 2023 USD ($) $ / MWh
--- | --- | ---
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Derivative Assets | $ | $ 2 | $ 5
Derivative liabilities | $ | $ (54) | $ (69)
Commodity Forward Price | Discounted cash flow | Minimum |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Measurement input | 22 | 31
Commodity Forward Price | Discounted cash flow | Maximum |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Measurement input | 68 | 65
Commodity Forward Price | Discounted cash flow | Weighted Average |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Measurement input | 45 | 43
Nodal Basis | Discounted cash flow | Minimum |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Measurement input | (8) | (8)
Nodal Basis | Discounted cash flow | Maximum |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Measurement input | (2) | (1)
Nodal Basis | Discounted cash flow | Weighted Average |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Measurement input | (5) | (5)

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