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Debt and Other Obligations Debt Securities Activity (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended |  | 1 Months Ended | 3 Months Ended | 1 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2013 | Mar. 31, 2013 | Nov. 30, 2012 2009 Series A | Dec. 31, 2012 2009 Series B | Mar. 31, 2013 electronotes | Dec. 31, 2012 electronotes | Mar. 31, 2013 1998 Series C | Mar. 31, 2013 Total | Dec. 31, 2012 2012 Series B | Mar. 31, 2013 electronotes | Mar. 31, 2013 Total
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of bond issuance (redemption) | $ (22) |  | $ (2) | [1] | $ (1) | [1] | $ (17) | [1] | $ (8) | [1] | $ (1,359) | [1] | $ (1,387) | $ 1,000 | [2] | $ 92 | $ 1,067
Interest rate |  |  | 2.25% | [1] | 3.77% | [1] | 4.98% | [1] | 4.91% | [1] | 6.00% | [1] |  | 3.50% | [2] | 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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