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Debt and Other Obligations Debt and Other Obligations - Debt Securities Activity (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Debt Instrument      
Issues of variable interest entities $ 0 $ 360 $ 1,000
Issues of power bonds 989 2,122 1,126
Amount 395 2,371  
Redemptions/Maturities of variable interest entities 30 13 6
Redemptions/Maturities of power bonds 365 2,358 2,717
Discount on debt issues (11) (30)  
Debt of variable interest entities
      
Debt Instrument      
Redemptions/Maturities of variable interest entities 30 [1] 13 [1]  
Electronotes
      
Debt Instrument      
Redemptions/Maturities of power bonds 335 [1] 50 [1]  
1998 Series C
      
Debt Instrument      
Redemptions/Maturities of power bonds 0 [1] 1,359 [1]  
1998 Series D
      
Debt Instrument      
Redemptions/Maturities of power bonds 0 [1] 2 [1]  
1999 Series A
      
Debt Instrument      
Redemptions/Maturities of power bonds 0 [1] 1 [1]  
2003 Series C
      
Debt Instrument      
Redemptions/Maturities of power bonds 0 [1] 940 [1]  
2009 Series A
      
Debt Instrument      
Redemptions/Maturities of power bonds 4 [1] 4 [1]  
2009 Series B
      
Debt Instrument      
Redemptions/Maturities of power bonds 26 [1] 2 [1]  
2013 Series A
      
Debt Instrument      
Percent of par value   99.52%  
2014 Series A
      
Debt Instrument      
Percent of par value 98.94%    
Total
      
Debt Instrument      
Percent of par value 100.00%    
Debt of variable interest entities
      
Debt Instrument      
Issues of variable interest entities 0 360  
Electronotes
      
Debt Instrument      
Issues of power bonds 0 152  
2012 Series B
      
Debt Instrument      
Issues of power bonds 0 1,000 [2]  
Percent of par value   97.49%  
2013 Series A
      
Debt Instrument      
Issues of power bonds 0 1,000 [3]  
2014 Series A
      
Debt Instrument      
Issues of power bonds 1,000 [4] 0  
Total
      
Debt Instrument      
Amount $ 989 $ 2,482  
[1] All redemptions were at 100 percent of par.
[2] The 2012 Series B bonds were issued at 97.49 percent of par.
[3] The 2013 Series A bonds were issued at 99.52 percent of par.
[4] The 2014 Series A bonds were issued at 98.94 percent of par.