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Fair Value of FInancial Instruments Schedule of Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure $ 150 $ 44
Domestic government, Debt securities 19 19
Corporate debt securities held in decommissioning trust assets 9 14
Money market funds 11 14
Fair Value - Money market funds 1 1
Domestic Equity Securities 3 4
Debt securities - domestic government 3 4
Electricity 156 17
Natural gas 231 120
Financial Instruments, Owned, at Fair Value 11 14
Assets, Fair Value Disclosure 583 237
Liabilities from price risk management activities: [Abstract]    
Electricity 146 123
Natural gas 47 14
Liabilities, Fair Value Disclosure 193 137
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure 150 44
Domestic government, Debt securities 9 9
Corporate debt securities held in decommissioning trust assets 0 0
Fair Value - Money market funds 1 1
Domestic Equity Securities 3 4
Debt securities - domestic government 3 4
Electricity 0 0
Natural gas 0 0
Financial Instruments, Owned, at Fair Value 166 62
Liabilities from price risk management activities: [Abstract]    
Electricity 0 0
Natural gas 0 0
Liabilities, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure 0 0
Domestic government, Debt securities 10 10
Corporate debt securities held in decommissioning trust assets 9 14
Fair Value - Money market funds 0 0
Domestic Equity Securities 0 0
Debt securities - domestic government 0 0
Electricity 93 16
Natural gas 225 115
Financial Instruments, Owned, at Fair Value 337 155
Liabilities from price risk management activities: [Abstract]    
Electricity 53 33
Natural gas 39 13
Liabilities, Fair Value Disclosure 92 46
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure 0 0
Domestic government, Debt securities 0 0
Corporate debt securities held in decommissioning trust assets 0 0
Money market funds 0  
Fair Value - Money market funds   0
Domestic Equity Securities 0 0
Debt securities - domestic government 0 0
Electricity 63 1
Natural gas 6 5
Financial Instruments, Owned, at Fair Value 69 6
Liabilities from price risk management activities: [Abstract]    
Electricity 93 90
Natural gas 8 1
Liabilities, Fair Value Disclosure 101 91
Non Qualified Benefit Plans [Member]    
Liabilities from price risk management activities: [Abstract]    
Insurance contracts, at cash surrender value $ 31 $ 36