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Commitments and Contingencies Commitments and Contingencies - Purchase Obligations (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Sep. 30, 2013 Hours Facilities Megawatts | Sep. 30, 2012 | Sep. 30, 2011 | Aug. 09, 2013
Obligations |  |  |  |
Membership interests of VIE subject to mandatory redemption | $ 40 | $ 0 |  | $ 40
Megawatts provided under power purchase obligations | 1,621 |  |  |
Remaining terms of the agreements, high end of range | 19 years |  |  |
Power purchased under agreement | 322 | 447 | 713 |
Number of U.S. Army Corps of Engineers hydroelectric facilities contracted with to obtain power | 8 |  |  |
Agreement termination notice period | 3 years |  |  |
Minimum required hours of power | 1,500 |  |  |
Megawatt allocation | 405 |  |  |
Number of hydroelectic facilities with reduced production | 2 |  |  |
Maximum term length for the purchase and transportation of coal | 10 years |  |  |
Long-term purchase commitment | 149 | 148 |  |
Maximum term for purchase of enriched uranium and fabrication of nuclear fuel assemblies | 17 years |  |  |
Purchase Agreements Required by Federal Law |  |  |  |
Obligations |  |  |  |
Megawatts provided under power purchase obligations | 913 |  |  |
Number of suppliers | 6 |  |  |
Purchase Obligations - Coal [Member] |  |  |  |
Obligations |  |  |  |
Long-term purchase commitment | 2,300 |  |  |
Purchase Obligations - Nuclear Fuel [Member] |  |  |  |
Obligations |  |  |  |
Long-term purchase commitment | 4,000 |  |  |
Purchase Obligations - Other |  |  |  |
Obligations |  |  |  |
Long-term purchase commitment | $ 2,554 |  |  |

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- Definition The maximum term for purchase of enriched uranium and fabrication of nuclear fuel assemblies. + References No definition available. + Details
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- Definition Maximum term length for the purchase and transportation of coal + References No definition available. + Details
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- Definition Number of megawatts provided under the power purchase obligations. + References No definition available. + Details
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- Definition Minimum required hours of power + References No definition available. + Details
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- Definition Number of hydroelectic facilities with reduced production. + References No definition available. + Details
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- Definition Number of U.S. Army Corps of Engineers hydroelectric facilities contracted with to obtain power + References No definition available. + Details
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- Definition The expense for power purchased under contractual power purchase obligations. + References No definition available. + Details
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- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
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- Definition The amount that would be paid, determined under the conditions specified in the contract, if as of the reporting date, the holder of the share has the right to redeem the shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6940734&loc=d3e22047-110879 + Details
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