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Asset Retirement Obligations (Details Textuals) (USD $)
12 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Mar. 31, 2011
Fermi 1 [Member]
Jun. 30, 2011
Fermi 1 [Member]
Dec. 31, 2011
Fermi 2 [Member]
Dec. 31, 2013
Fermi 2 [Member]
Asset Retirement Obligations [Line Items]          
Asset Retirement Obligations, Liability Not Recognized Natural gas storage system assets, substations, manholes and certain other distribution assets have an indeterminate life. Therefore, no liability has been recorded for these assets.        
Revision in estimated cash flows $ 10,000,000 $ 19,000,000 $ 20,000,000 $ 22,000,000  
Reserve and Impairment of Retirement Obligation     6,000,000    
Proposed Extension of Nuclear Plant 2 License         20 years
Estimated decommissioning expenses, current fiscal year dollars         1,600,000,000
Estimated decommissioning expenses, end of extended license dollars         10,000,000,000
Inflation Rate Used to Determine Estimated Decommissioning Expenditures         6.00%
Nuclear Decommissioning Liabilities Funded Through Surcharge and Included In ARO Balance         1,600,000,000
Liabilities Balance upon Completion of Decommissioning $ 0