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Fair Value Measurements (Schedule of Valuation Process and Unobservable Inputs) (Details) - Power
$ in Millions
Dec. 31, 2025
USD ($)
$ / MWh
Dec. 31, 2024
USD ($)
$ / MWh
Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets | $ $ 11 $ 6
Derivative Liability | $ $ (66) $ (53)
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 33 32
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 72 69
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 43 45
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 (9) (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) (2)
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)