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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 | 3 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Jan. 15, 2013 | Nov. 30, 2012 2009 Series A | Dec. 31, 2012 2009 Series B | Dec. 31, 2012 Electronotes | Dec. 31, 2012 Total | Dec. 31, 2012 2012 Series B | Dec. 31, 2012 Total
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |
Amount | $ 1,000 | [1] |  | $ 2 | [2] | $ 1 | [2] | $ 8 | [2] | $ 11 | $ 1,000 | [1] | $ 975
Interest rate |  |  |  | 2.25% | [2] | 3.77% | [2] | 4.91% | [2] |  | 3.50% | [1] |
Discount on debt issues | $ (25) |  |  |  |  |  |  |  |  |  |  |  |
Percent of par value |  |  | 100.00% |  |  |  |  |  |  | 100.00% | 97.49% |  |
[1] | The 2012 Series B bonds were issued at 97.49 percent of par.
[2] | All redemptions were at 100 percent of par.

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