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Fair Value of FInancial Instruments Schedule of Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure $ 26   $ 112
Domestic government, Debt securities 24   25
Corporate debt securities held in decommissioning trust assets 9   10
Money market funds 13   7
Fair Value - Money market funds 1   2
Domestic Equity Securities 7   6
Debt securities - domestic government 1   1
Electricity 16   12
Natural gas 22   8
Financial Instruments, Owned, at Fair Value 13   7
Assets, Fair Value Disclosure 119   183
Derivative Liability 0 $ 5 4
Liabilities from price risk management activities: [Abstract]      
Electricity 119   94
Natural gas 12   58
Liabilities, Fair Value Disclosure 131   156
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 26   112
Domestic government, Debt securities 8   7
Corporate debt securities held in decommissioning trust assets 0   0
Fair Value - Money market funds 1   2
Domestic Equity Securities 7   6
Debt securities - domestic government 1   1
Electricity 0   0
Natural gas 0   0
Financial Instruments, Owned, at Fair Value 43   128
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 16   18
Corporate debt securities held in decommissioning trust assets 9   10
Fair Value - Money market funds 0   0
Domestic Equity Securities 0   0
Debt securities - domestic government 0   0
Electricity 9   9
Natural gas 21   8
Financial Instruments, Owned, at Fair Value 55   45
Derivative Liability     4
Liabilities from price risk management activities: [Abstract]      
Electricity 14   10
Natural gas 12   51
Liabilities, Fair Value Disclosure 26   65
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 7   3
Natural gas 1   0
Financial Instruments, Owned, at Fair Value 8   3
Liabilities from price risk management activities: [Abstract]      
Electricity 105   84
Natural gas 0   7
Liabilities, Fair Value Disclosure 105   91
Non Qualified Benefit Plans [Member]      
Liabilities from price risk management activities: [Abstract]      
Insurance contracts, at cash surrender value $ 29   $ 27