Asset Retirement Obligations (Details Textuals) (USD $)
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12 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 12 Months Ended |
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Dec. 31, 2013
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Mar. 31, 2011
Fermi 1 [Member]
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Jun. 30, 2011
Fermi 1 [Member]
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Dec. 31, 2011
Fermi 2 [Member]
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Dec. 31, 2013
Fermi 2 [Member]
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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 |