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Regulatory Assets and Liabilities Regulatory Assets and Liabilities (Details) (USD $) | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Jul. 31, 2005 Units | Sep. 30, 2013 Deferred Nuclear Generating Units and Construction Costs | Jul. 31, 2005 Deferred Nuclear Generating Units and Construction Costs | Sep. 30, 2013 Environmental Cleanup Costs - Kingston Ash Spill | Sep. 30, 2010 Environmental Cleanup Costs - Kingston Ash Spill | Sep. 30, 2009 Environmental Cleanup Costs - Kingston Ash Spill | Sep. 30, 2013 Environmental Agreements | Sep. 30, 2013 Energy Efficiency Projects Environmental Agreements | Sep. 30, 2013 Paid to States Environmental Agreements | Sep. 30, 2013 Civil Penalties Environmental Agreements | Sep. 30, 2013 Derivatives Under FTP | Sep. 30, 2012 Derivatives Under FTP | Sep. 30, 2013 Deferred nuclear generating units
Regulatory Assets and Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized gains (losses) |  |  |  |  |  |  |  |  |  |  |  |  | $ 166,000,000 | [1] | $ 228,000,000 | [1] |
Investment in deferred generating units |  |  |  |  | 3,900,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of deferred generating units |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Noncurrent Asset, Amortization Period |  |  |  | P10Y |  | P15Y |  |  |  |  |  |  |  |  |  |  |
Remaining balance to be included in plant asset balance at completion |  |  |  | 619,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets | 9,692,000,000 | 11,901,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000,000
Yearly amortization of Deferred nuclear generating units | 237,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial regulatory asset |  |  |  |  |  |  |  |  | 360,000,000 |  |  |  |  |  |  |  |
Investment in energy efficiency projects |  |  |  |  |  |  |  |  | 290,000,000 |  |  |  |  |  |  |  |
Amount to be provided to fund environmental projects |  |  |  |  |  |  |  |  | 60,000,000 |  |  |  |  |  |  |  |
Amount to be paid in civil penalties |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |
Regulatory asset amount expensed |  |  |  |  |  |  |  |  |  | 52,000,000 | 36,000,000 | 10,000,000 |  |  |  |  |
Total recorded estimate of Kingston cleanup costs | 1,100,000,000 |  |  |  |  | 1,100,000,000 |  | 933,000,000 |  |  |  |  |  |  |  |  |
Estimate increase |  |  |  |  |  |  | $ 192,000,000 |  |  |  |  |  |  |  |  |  |
Current regulatory asset amortization period |  |  |  |  |  | 12 months |  |  |  |  |  |  |  |  |  |  |
[1] | The September 30, 2013, and September 30, 2012 balances in the Derivatives Under Financial Trading Program table show all open derivative positions in the FTP.

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- Definition Amount of environmental agreements to be paid in civil penalties. + References No definition available. + Details
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- Definition Amount to be provided to fund environmental projects in Alabama, Kentucky, North Carolina, and Tennessee + References No definition available. + Details
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- Definition The total initial liability recorded for environmental agreements. This was deferred as a regulatory asset, after board approval, to collect this amount in rates. + References No definition available. + Details
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- Definition The amortization period for recovery of the individual regulatory current asset in a schedule of regulatory assets. + References No definition available. + Details
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- Definition The remaining balance in the deferred generating units regulatory asset will not continue to be amortized into rates, but will be included in the plant asset balance at completion of construction. + References No definition available. + Details
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- Definition The yearly expense to be charged against earnings to allocate the capitalized costs of the deferred nuclear generating units regulatory asset. + References No definition available. + Details
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- Definition The Increase or Decrease in the accrual for environmental loss in the period from revisions in estimates to existing obligations. The amount does not relate to changes in the environmental accrual related to business acquisitions or divestitures, or to currency movements. + 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.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition The amortization period for recovery of the individual regulatory noncurrent asset in a schedule of regulatory noncurrent assets. + References No definition available. + Details
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