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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, 2013
Sep. 30, 2012
Debt Instrument    
Amount $ 2,371 $ 2,723
Discount on debt issues (30) (9)
Debt of variable interest entities
    
Debt Instrument    
Amount 13 [1] 6 [1]
Electronotes
    
Debt Instrument    
Amount 50 [1] 189 [1]
1992 Series D
    
Debt Instrument    
Amount 0 [1] 1,000 [1]
1998 Series C
    
Debt Instrument    
Amount 1,359 [1] 0 [1]
1998 Series D
    
Debt Instrument    
Amount 2 [1] 5 [1]
1999 Series A
    
Debt Instrument    
Amount 1 [1] 2 [1]
2000 Series F
    
Debt Instrument    
Amount 0 [1] 29 [1]
2002 Series A
    
Debt Instrument    
Amount 0 [1] 1,486 [1]
2003 Series C
    
Debt Instrument    
Amount 940 [1] 0 [1]
2009 Series A
    
Debt Instrument    
Amount 4 [1] 4 [1]
2009 Series B
    
Debt Instrument    
Amount 2 [1] 2 [1]
Total
    
Debt Instrument    
Percent of par value 100.00%  
Debt of variable interest entities
    
Debt Instrument    
Amount 360 1,000
Electronotes
    
Debt Instrument    
Amount 152 135
2012 Series A
    
Debt Instrument    
Percent of par value   99.12%
Amount 0 1,000 [2]
2012 Series B
    
Debt Instrument    
Percent of par value 97.49%  
Amount 1,000 [3] 0
2013 Series A
    
Debt Instrument    
Percent of par value 99.52%  
Amount 1,000 [4] 0
Total
    
Debt Instrument    
Amount $ 2,482 $ 2,126
[1] All redemptions were at 100 percent of par.
[2] The 2012 Series A bonds were issued at 99.12 percent of par.
[3] The 2012 Series B bonds were issued at 97.49 percent of par.
[4] The 2013 Series A bonds were issued at 99.52 percent of par.