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Debt and Other Obligations Debt Securities Activity (Details) (USD $) In Millions, unless otherwise specified |  | 1 Months Ended | 3 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | May 31, 2013 2009 Series A | Nov. 30, 2012 2009 Series A | Jun. 30, 2013 2009 Series B | Dec. 31, 2012 2009 Series B | Jun. 30, 2013 electronotes | Mar. 31, 2013 electronotes | Dec. 31, 2012 electronotes | Mar. 31, 2013 1998 Series C | Jun. 30, 2013 Total | May 31, 2013 1999 Series A [Member] | Jun. 30, 2013 1998 Series D [Member] | Dec. 31, 2012 2012 Series B | Jun. 30, 2013 electronotes | Mar. 31, 2013 electronotes | Jun. 30, 2013 Total
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of bond issuance (redemption) |  | $ (2) | [1] | $ (2) | [1] | $ (1) | [1] | $ (1) | [1] | $ (24) | [1] | $ (17) | [1] | $ (8) | [1] | $ (1,359) | [1] | $ (1,417) | $ (1) | [1] | $ (2) | [1] | $ 1,000 | [2] | $ 13 | $ 92 | $ 1,080
Interest rate |  | 2.25% | [1] | 2.25% | [1] | 3.77% | [1] | 3.77% | [1] | 4.18% | [1] | 4.98% | [1] | 4.91% | [1] | 6.00% | [1] |  | 4.15% | [1] | 4.06% | [1] | 3.50% | [2] | 3.15% | 3.21% |
Discount on debt issues | $ (25) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of par value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  | 97.49% |  |  |  |
[1] | All redemptions were at 100 percent of par.
[2] | The 2012 Series B bonds were issued at 97.49 percent of par.

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