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Debt and Other Obligations Debt Outstanding (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Sep. 30, 2012
--- | --- | ---
Short-term debt |  |
Short-term debt, net | $ 1,000 | $ 1,507
Current maturities of long-term debt of variable interest entities | 13 | 13
Current maturities of power bonds | 2,324 | 2,308
Total current debt outstanding, net | 3,337 | 3,828
Long-term debt |  |
Long-term debt of variable interest entities | 981 | 981
Long-term power bonds | 21,307 | 20,330
Unamortized discounts, premiums and other | (85) | (61)
Total long-term debt, net | 22,203 | 21,250
Total outstanding debt | $ 25,540 | $ 25,078

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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