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Fair Value of FInancial Instruments Schedule of Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure $ 112 $ 30
Domestic government, Debt securities 25 11
Corporate debt securities held in decommissioning trust assets 10 6
Money market funds 7 25
Fair Value - Money market funds 2 1
Domestic Equity Securities 6 7
Debt securities - domestic government 1 1
Electricity 12 3
Natural gas 8 3
Financial Instruments, Owned, at Fair Value 7 25
Assets, Fair Value Disclosure 183 87
Derivative Liability 4  
Liabilities from price risk management activities: [Abstract]    
Electricity 94 135
Natural gas 58 75
Liabilities, Fair Value Disclosure 156 210
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 112 30
Domestic government, Debt securities 7 4
Corporate debt securities held in decommissioning trust assets 0 0
Fair Value - Money market funds 2 1
Domestic Equity Securities 6 7
Debt securities - domestic government 1 1
Electricity 0 0
Natural gas 0 0
Financial Instruments, Owned, at Fair Value 128 43
Derivative Liability 0  
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 18 7
Corporate debt securities held in decommissioning trust assets 10 6
Fair Value - Money market funds 0 0
Domestic Equity Securities 0 0
Debt securities - domestic government 0 0
Electricity 9 3
Natural gas 8 3
Financial Instruments, Owned, at Fair Value 45 19
Derivative Liability 4  
Liabilities from price risk management activities: [Abstract]    
Electricity 10 5
Natural gas 51 66
Liabilities, Fair Value Disclosure 65 71
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 3 0
Natural gas 0 0
Financial Instruments, Owned, at Fair Value 3 0
Derivative Liability 0  
Liabilities from price risk management activities: [Abstract]    
Electricity 84 130
Natural gas 7 9
Liabilities, Fair Value Disclosure 91 139
Non Qualified Benefit Plans [Member]    
Liabilities from price risk management activities: [Abstract]    
Insurance contracts, at cash surrender value $ 27 $ 28