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Debt and Other Obligations Debt and Other Obligations - Debt Securities Activity (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Debt Instrument |  |  |  |
Issues of power bonds |  | $ 973 | $ 989 | $ 2,122
Discount on debt issues |  | (27) | (11) |
Total |  | 1,212 | 395 |
Redemptions/Maturities of variable interest entities |  | 32 | 30 | 13
Redemptions/Maturities of power bonds |  | $ 1,180 | 365 | $ 2,358
2014 Series A |  |  |  |
Debt Instrument |  |  |  |
Percent of par value |  | 98.94% |  |
2015 Series A |  |  |  |
Debt Instrument |  |  |  |
Percent of par value |  | 97.31% |  |
Debt of variable interest entities |  |  |  |
Debt Instrument |  |  |  |
Redemptions/Maturities of variable interest entities | [1] | $ 32 | 30 |
Electronotes |  |  |  |
Debt Instrument |  |  |  |
Redemptions/Maturities of power bonds | [1] | 62 | 335 |
1998 Series D |  |  |  |
Debt Instrument |  |  |  |
Redemptions/Maturities of power bonds | [1] | 50 | 0 |
1999 Series A |  |  |  |
Debt Instrument |  |  |  |
Redemptions/Maturities of power bonds | [1] | 38 | 0 |
2005 Series B |  |  |  |
Debt Instrument |  |  |  |
Redemptions/Maturities of power bonds | [1] | 1,000 | 0 |
2009 Series A |  |  |  |
Debt Instrument |  |  |  |
Redemptions/Maturities of power bonds | [1] | 3 | 4 |
2009 Series B |  |  |  |
Debt Instrument |  |  |  |
Redemptions/Maturities of power bonds | [1] | $ 27 | 26 |
Total |  |  |  |
Debt Instrument |  |  |  |
Percent of par value |  | 100.00% |  |
2014 Series A |  |  |  |
Debt Instrument |  |  |  |
Issues of power bonds | [2] | $ 0 | 1,000 |
2015 Series A |  |  |  |
Debt Instrument |  |  |  |
Issues of power bonds | [3] | 1,000 | 0 |
Total |  |  |  |
Debt Instrument |  |  |  |
Total |  | $ 973 | $ 989 |
[1] | All redemptions were at 100 percent of par.
[2] | The 2014 Series A bonds were issued at 98.94 percent of par.
[3] | The 2015 Series A bonds were issued at 97.31 percent of par.

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