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Fair Value of FInancial Instruments Schedule of Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure $ 44 $ 255
Domestic government, Debt securities 19 20
Corporate debt securities held in decommissioning trust assets 14 13
Money market funds 14 12
Fair Value - Money market funds 1 1
Domestic Equity Securities 4 7
Debt securities - domestic government 4 1
Electricity 17 8
Natural gas 120 37
Financial Instruments, Owned, at Fair Value 14 12
Assets, Fair Value Disclosure 237 354
Liabilities from price risk management activities: [Abstract]    
Electricity 123 146
Natural gas 14 5
Liabilities, Fair Value Disclosure 137 151
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 44 255
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 4 7
Debt securities - domestic government 4 1
Electricity 0 0
Natural gas 0 0
Financial Instruments, Owned, at Fair Value 62 273
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 11
Corporate debt securities held in decommissioning trust assets 14 13
Fair Value - Money market funds 0 0
Domestic Equity Securities 0 0
Debt securities - domestic government 0 0
Electricity 16 4
Natural gas 115 36
Financial Instruments, Owned, at Fair Value 155 64
Liabilities from price risk management activities: [Abstract]    
Electricity 33 5
Natural gas 13 4
Liabilities, Fair Value Disclosure 46 9
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 1 4
Natural gas 5 1
Financial Instruments, Owned, at Fair Value 6 5
Liabilities from price risk management activities: [Abstract]    
Electricity 90 141
Natural gas 1 1
Liabilities, Fair Value Disclosure 91 142
Non Qualified Benefit Plans [Member]    
Liabilities from price risk management activities: [Abstract]    
Insurance contracts, at cash surrender value $ 36 $ 33