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Debt and Other Obligations Debt Securities Activity (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 | May. 31, 2015 | Dec. 31, 2014 | Nov. 30, 2014 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Debt Instrument |  |  |  |  |  |  |  |  |  |
Redemptions/maturities of power bonds |  |  |  |  |  |  |  |  | $ 1,180 | $ 363
Redemptions/maturities of variable interest entities |  |  |  |  |  |  |  |  | 15 | $ 15
Total redemptions/maturities of debt |  |  |  |  |  |  |  |  | $ 1,195 |
electronotes |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Redemptions/maturities of power bonds | [1] |  |  |  |  | $ 19 | $ 42 | $ 1 |  |
Interest rate |  | 4.05% |  | 2.65% |  | 4.05% | 4.20% | 2.65% | 4.05% |
2009 Series A |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Redemptions/maturities of power bonds | [1] |  | $ 1 |  | $ 2 |  |  |  |  |
Interest rate |  |  | 2.25% |  | 2.25% |  |  |  |  |
1998 Series D |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Redemptions/maturities of power bonds | [1] | $ 50 |  |  |  |  |  |  |  |
Interest rate |  | 3.83% |  |  |  | 3.83% |  |  | 3.83% |
2009 Series B |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Redemptions/maturities of power bonds | [1] | $ 26 |  | $ 1 |  |  |  |  |  |
Interest rate |  | 3.77% |  | 3.77% |  | 3.77% |  | 3.77% | 3.77% |
2005 Series B |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Redemptions/maturities of power bonds | [1] | $ 1,000 |  |  |  |  |  |  |  |
Interest rate |  | 4.38% |  |  |  | 4.38% |  |  | 4.38% |
1999 Series A |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Redemptions/maturities of power bonds | [1] |  | $ 38 |  |  |  |  |  |  |
Interest rate |  |  | 3.96% |  |  |  |  |  |  |
Debt of variable interest entities |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Redemptions/maturities of variable interest entities | [1] |  |  |  |  |  | $ 15 |  |  |
Interest rate of variable interest entities |  |  |  |  |  |  | 4.29% |  |  |
Total |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Percent of par value |  | 100.00% |  |  |  | 100.00% |  |  | 100.00% |
[1] | All redemptions were at 100 percent of par.

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