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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, 2016 | Dec. 31, 2015 | Nov. 30, 2015 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |
Redemptions/maturities of power bonds |  |  |  |  | $ 35 | [1] |  |  |  |  | $ 35 | $ 1,180
Redemptions/maturities of variable interest entities |  |  |  |  |  |  |  |  |  |  | 16 | $ 15
Total redemptions/maturities of debt | [1] |  |  |  |  |  |  |  |  |  | $ 51 |
electronotes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |
Redemptions/maturities of power bonds |  |  |  |  | $ 3 |  | $ 2 | [1] | $ 1 | [1] |  |
Interest rate |  | 2.97% | 2.65% |  | 2.97% |  | 3.51% |  | 2.65% |  | 2.97% |
2009 Series A |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |
Redemptions/maturities of power bonds | [1] |  |  | $ 2 |  |  |  |  |  |  |  |
Interest rate |  |  |  | 2.25% |  |  |  |  |  |  |  |
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% |
Debt of variable interest entities |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |
Redemptions/maturities of variable interest entities | [1] |  |  |  |  |  |  |  |  |  | $ 16 |
Interest Rate of variable interest entities |  | 4.30% |  |  | 4.30% |  |  |  |  |  | 4.30% |
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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