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Debt and Other Obligations Debt Outstanding (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Sep. 30, 2012
--- | --- | ---
Short-term debt |  |
Short-term debt, net | $ 2,045 | $ 1,507
Current maturities of long-term debt of variable interest entities | 13 | 13
Current maturities of power bonds | 1,242 | 2,308
Total current debt outstanding, net | 3,300 | 3,828
Long-term debt |  |
Long-term debt of variable interest entities | 975 | 981
Long-term power bonds | 21,042 | 20,330
Unamortized discounts, premiums and other | (83) | (61)
Total long-term debt, net | 21,934 | 21,250
Total outstanding debt | $ 25,234 | $ 25,078

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