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Commitments and Contingencies Commitments and Contingencies - Purchase Obligations (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Sep. 30, 2014 Facilities Hours Megawatts | Sep. 30, 2013 | Sep. 30, 2012 | Aug. 09, 2013
Obligations |  |  |  |
Membership interests of VIE subject to mandatory redemption | $ 50 | $ 50 |  | $ 40
Megawatts provided under power purchase obligations | 1,621 |  |  |
Remaining terms of the agreements, high end of range | 18 years |  |  |
Power purchased under agreement | 293 | 322 | 447 |
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 |  |  |
Maximum term length for the purchase and transportation of coal | 6 years |  |  |
Maximum term for purchase of enriched uranium and fabrication of nuclear fuel assemblies | 16 years |  |  |
Purchase Agreements Required by Federal Law |  |  |  |
Obligations |  |  |  |
Megawatts provided under power purchase obligations | 890 |  |  |
Number of suppliers | 6 |  |  |
Purchase Obligations - Coal |  |  |  |
Obligations |  |  |  |
Long-term purchase commitment | 1,600 |  |  |
Purchase Obligations - Nuclear Fuel |  |  |  |
Obligations |  |  |  |
Long-term purchase commitment | 3,700 |  |  |
Purchase Obligations - Other |  |  |  |
Obligations |  |  |  |
Long-term purchase commitment | $ 2,752 |  |  |

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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 Number of megawatts provided under the power purchase obligations. + 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 Amount that would be paid, determined under the conditions specified in the contract, if 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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