XML 24 R50.htm IDEA: XBRL DOCUMENT v2.4.0.6
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.