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Fair Value Measurements (Schedule of Valuation Process and Unobservable Inputs) (Details) - Power $ in Millions | Dec. 31, 2022 USD ($) $ / MWh $ / MMBTU | Dec. 31, 2021 USD ($) $ / MWh $ / MMBTU
--- | --- | ---
Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative assets | $ | $ 20 | $ 13
Derivative Liability | $ | $ (41) | $ (145)
Measurement Input, Commodity Forward Price | Minimum | Discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | 38 | 32
Measurement Input, Commodity Forward Price | Maximum | Discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | 89 | 55
Measurement Input, Commodity Forward Price | Weighted Average | Discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | 51 | 40
Measurement Input, Nodal Basis | Minimum | Discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | (10) | (14)
Measurement Input, Nodal Basis | Maximum | Discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | (1) | 0
Measurement Input, Nodal Basis | Weighted Average | Discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | (4) | (2)
Measurement Input, Commodity Future Price | Minimum | Discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | $ / MMBTU | 0 |
Measurement Input, Commodity Future Price | Maximum | Discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | $ / MMBTU | 1 |
Measurement Input, Commodity Future Price | Weighted Average | Discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | $ / MMBTU | 0 | 0

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