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Commitments and Contingencies Commitments and Contingencies - Contingencies (Details) (USD $) | 12 Months Ended
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Sep. 30, 2013 reactors Procedures Sites Areas Insurance_layers Phases Units | Sep. 30, 2012 | Sep. 30, 2011
Contingencies |  |  |
Nuclear liability insurance | $ 375,000,000 |  |
Assessment from licensees for each licensed reactor | 127,000,000 |  |
Number of licensed reactors in US | 104 |  |
Nuclear accident assessment limitation per year per unit | 19,000,000 |  |
Number of licensed nuclear units | 6 |  |
Maximum assessment per nuclear incident | 764,000,000 |  |
Maximum payment required per accident in any one year | 114,000,000 |  |
Total amount of protection available | 13,000,000,000 |  |
Surcharge for legal expenses | 5.00% |  |
The U.S. Congress is required to take action if these layes are exhausted | 2 |  |
Amount of property, decommissioning, and decontamination insurance carried | 4,600,000,000 |  |
Amount of insurance available for loss at any one site | 2,100,000,000 |  |
Number of sites | 1 |  |
Maximum amount of retrospecitve premiums | 105,000,000 |  |
Maximum idemnity if a covered accident tasks or keeps a nuclear unit offline | 490,000,000 |  |
Maximum amount of retrospective premiums | 32,000,000 |  |
Number of procedures for determining estimates for the costs of nuclear decommissioning | 2 |  |
Amount spent to reduce emissions since 1977 | 5,600,000,000 |  |
Amount spent to reduce emissions | 182,000,000 | 38,000,000 | 34,000,000
Possible additional future costs for compliance with Clean Air Act requirements | 1,300,000,000 |  |
Estimated liability for cleanup and similar environmental work on a non-discounted basis | 15,000,000 |  |
Number of areas of cleanup | 4 |  |
Number of phases of soil cleanup | 2 |  |
Amount of settlement for potential liability related to soil cleanup | 300,000 |  |
Cost estimate for first phase of soil cleanup | 55,000,000 |  |
Cost estimate for second phase of soil cleanup | 10,000,000 |  |
Low end of cleanup estimate | 6,000,000 |  |
High end of cleanup estimate | 25,000,000 |  |
Remaining natural resource damages are less than | 1,000,000 |  |
Percent of Operation and Maintenance Cost | 80.00% |  |
Expected increase (decrease) in operation and maintenance expense | 500,000,000 |  |
Nuclear |  |  |
Contingencies |  |  |
Future estimated decommissioning cost | 2,400,000,000 |  |
Non-nuclear |  |  |
Contingencies |  |  |
Future estimated decommissioning cost | $ 1,100,000,000 |  |

X
- Definition The amount of property, decommissioning, and decontamination insurance available for loss at any one site to cover the cost of stabilizing or shutting down a reactor after an accident. + References No definition available. + Details
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- Definition The amount of property, decommissioning, and decontamination insurance carried for nuclear plants owned to cover the cost of stabilizing or shutting down a reactor after an accident. + References No definition available. + Details
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- Definition The amount of the settlement for potential liability related to soil cleanup. + References No definition available. + Details
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- Definition The amount spent to reduce emissions at power plants. + References No definition available. + Details
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- Definition The amount spent since 1977 to reduce emissions at power plants. + References No definition available. + Details
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- Definition An assessment from licensees for each licensed nuclear reactor in the United States to fund the second layer, the Secondary Financial Program. + References No definition available. + Details
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- Definition Cost estimate for first phase of soil cleanup + References No definition available. + Details
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- Definition The expected increase (decrease) in operation and maintenance expense. + References No definition available. + Details
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- Definition High end of cleanup estimate for off-site contamination + References No definition available. + Details
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- Definition The maximum amount of retrospecitve premiums that may be required for property, decommissioning, and decontamination insurance. + References No definition available. + Details
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- Definition Maximum assessment per nuclear incident. + References No definition available. + Details
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- Definition The maximum idemnity per unit if an accident covered by the policy tasks or keeps a nuclear unit offline. + References No definition available. + Details
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- Definition The maximum payment that would be required per accident in any one year. + References No definition available. + Details
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- Definition The per year per unit limitation of the assessment for any nuclear accident + References No definition available. + Details
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- Definition For the first layer of protection all NRC nuclear plant licensees purchase nuclear insurance from American Nuclear Insurers for each nuclear plant with an operating license. + References No definition available. + Details
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- Definition Number of areas of cleanup + References No definition available. + Details
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- Definition The number of licensed nuclear units owned. + References No definition available. + Details
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- Definition The number of licensed reactors in US. + References No definition available. + Details
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- Definition Number of procedures for determining estimates for the costs of nuclear decommissioning + References No definition available. + Details
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- Definition Number of sites + References No definition available. + Details
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- Definition The percent of operation and maintenance cost. + References No definition available. + Details
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- Definition The possible additional future costs for compliance with Clean Air Act requirements. + References No definition available. + Details
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- Definition The maximum amount of retrospective premiums that could be required for accidental outage insurance. + References No definition available. + Details
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- Definition The total amount of protection available to compensate for losses arising from a nuclear event in the United States. + References No definition available. + Details
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- Definition Undiscounted amount of the accrual for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q1) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section Y -Paragraph Question 1 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 + Details
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