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Fair Value of Financial Assets and Liabilities - Fair Value Inputs Assets Quantitative Information (Details) - Derivative [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative Liability, Fair Value, Amount Not Offset Against Collateral $ (84,000,000) $ (219,000,000)
Minimum [Member] | Discounted Cash Flow [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value Inputs Forward Power Price 34.78 28.65
Arithmetic Average [Member] | Discounted Cash Flow [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value Inputs Forward Power Price 48.44 33.96
Maximum [Member] | Discounted Cash Flow [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value Inputs Forward Power Price 75.71 47.10
Commonwealth Edison Co [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative Liability, Fair Value, Amount Not Offset Against Collateral $ (84,000,000) $ (219,000,000)
Commonwealth Edison Co [Member] | Minimum [Member] | Discounted Cash Flow [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value Inputs Forward Power Price 34.78 28.65
Commonwealth Edison Co [Member] | Arithmetic Average [Member] | Discounted Cash Flow [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value Inputs Forward Power Price 48.44 33.96
Commonwealth Edison Co [Member] | Maximum [Member] | Discounted Cash Flow [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value Inputs Forward Power Price 75.71 47.10