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Debt and Other Obligations Debt Securities Activity (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 1 Months Ended | 3 Months Ended |  | 1 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | May 31, 2014 2009 Series A [Member] | Nov. 30, 2013 2009 Series A [Member] | Jun. 30, 2014 electronotes | Mar. 31, 2014 electronotes | Dec. 31, 2013 electronotes | Jun. 30, 2014 Total | Jun. 30, 2014 2009 Series B [Member] | Dec. 31, 2013 2009 Series B [Member]
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemptions/maturities of power bonds | $ 363 |  | $ 1,417 | $ 2 | [1] | $ 2 | [1] | $ 3 | [1] | $ 326 | [1] | $ 4 | [1] |  | $ 25 | [1] | $ 1 | [1]
Interest rate of power bonds |  |  |  | 2.25% | [1] | 2.25% | [1] | 3.14% | [1] | 4.52% | [1] | 3.56% | [1] |  | 3.77% | [1] | 3.77% | [1]
Percent of par value |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |
Variable interest entities | 15 | [1] | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of variable interest entities | 4.30% | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total redemptions/maturities of debt | $ 378 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | All redemptions were at 100 percent of par.

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