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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.