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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.