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Debt and Other Obligations Debt Securities Activity (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended
Jun. 30, 2014
Jun. 30, 2013
May 31, 2014
2009 Series A [Member]
Nov. 30, 2013
2009 Series A [Member]
Jun. 30, 2014
electronotes
Mar. 31, 2014
electronotes
Dec. 31, 2013
electronotes
Jun. 30, 2014
Total
Jun. 30, 2014
2009 Series B [Member]
Dec. 31, 2013
2009 Series B [Member]
Debt Instrument                    
Redemptions/maturities of power bonds $ 363 $ 1,417 $ 2 [1] $ 2 [1] $ 3 [1] $ 326 [1] $ 4 [1]   $ 25 [1] $ 1 [1]
Interest rate of power bonds     2.25% [1] 2.25% [1] 3.14% [1] 4.52% [1] 3.56% [1]   3.77% [1] 3.77% [1]
Percent of par value               100.00%    
Variable interest entities 15 [1] 6                
Interest rate of variable interest entities 4.30% [1]                  
Total redemptions/maturities of debt $ 378                  
[1] All redemptions were at 100 percent of par.