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Debt and Other Obligations Debt and Other Obligations - Put and Call Options (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2013
Basis_points
Rate_resets
Debt Instrument  
Amount of redeemable bond issues outstanding $ 848
Call price - low end of range 100.00%
Bond issues with survivor's option 23
Bonds outstanding with survivor's option 708
Number of issues of Putable Automatic Rate Reset Securities outstanding 2
Fixed-rate period for coupon rate reset on PARRS 5 years
Average time period 5 days
PARRS 1998 Series D Bond
  
Debt Instrument  
Amount of redeemable bond issues outstanding 324
Debt Instrument, Basis Point Spread on Variable Rate 94
Number of rate resets 6
PARRS interest rate prior to rate reset 6.75%
PARRS interest rate after rate reset 3.83%
Amount of bonds redeemed 251
PARRS 1999 Series A Bond
  
Debt Instrument  
Amount of redeemable bond issues outstanding 270
Debt Instrument, Basis Point Spread on Variable Rate 84
Number of rate resets 5
PARRS interest rate prior to rate reset 6.50%
PARRS interest rate after rate reset 3.955%
Amount of bonds redeemed $ 255