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Label Element Value
Short term Borrowings [Member]  
Debt Instrument, Interest Rate, Effective Percentage us-gaap_DebtInstrumentInterestRateEffectivePercentage 0.82%
Debt Instrument, Interest Rate, Effective Percentage us-gaap_DebtInstrumentInterestRateEffectivePercentage 0.82%
Debt Instrument, Interest Rate, Effective Percentage us-gaap_DebtInstrumentInterestRateEffectivePercentage 1.09%
Notes Payable to Bank, Current us-gaap_NotesPayableToBankCurrent $ 0
Notes Payable to Bank, Current us-gaap_NotesPayableToBankCurrent 0
Notes Payable to Bank, Current us-gaap_NotesPayableToBankCurrent 28,000,000
Short-term Debt, Maximum Amount Outstanding During Period us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod 0
Short-term Debt, Maximum Amount Outstanding During Period us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod 24,000,000
Short-term Debt, Maximum Amount Outstanding During Period us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod $ 37,000,000
Short-term Debt, Weighted Average Interest Rate us-gaap_ShortTermDebtWeightedAverageInterestRate 1.02%
Short-term Debt, Weighted Average Interest Rate us-gaap_ShortTermDebtWeightedAverageInterestRate 0.81%
Short-term Debt, Weighted Average Interest Rate us-gaap_ShortTermDebtWeightedAverageInterestRate 0.92%
Short-term Debt, Average Outstanding Amount us-gaap_ShorttermDebtAverageOutstandingAmount $ 0
Short-term Debt, Average Outstanding Amount us-gaap_ShorttermDebtAverageOutstandingAmount 6,181,000
Short-term Debt, Average Outstanding Amount us-gaap_ShorttermDebtAverageOutstandingAmount 4,112,000
Syndicated Revolving Credit Facility [Member] | Letter of Credit American Recovery and Reinvestment Act Cost Reimbursements [Member] | Parent Company [Member]  
Letters of Credit Outstanding, Amount us-gaap_LettersOfCreditOutstandingAmount 5,800,000
Syndicated Revolving Credit Facility [Member] | Letter of Credit Business Automobile Insurance Policy Security [Member] | Parent Company [Member]  
Letters of Credit Outstanding, Amount us-gaap_LettersOfCreditOutstandingAmount 340,000
Syndicated Revolving Credit Facility [Member] | Letter of Credit Irrevocable Edison Settlement Agreement [Member] | Parent Company [Member]  
Letters of Credit Outstanding, Amount us-gaap_LettersOfCreditOutstandingAmount 3,600,000
Syndicated Revolving Credit Facility [Member] | Letter of Credit Purchase of Power Security [Member] | Parent Company [Member]  
Letters of Credit Outstanding, Amount us-gaap_LettersOfCreditOutstandingAmount $ 585,000,000