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Debt and Other Obligations Debt and Other Obligations - Put and Call Options (Details)
$ in Millions
 12 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Units
Debt Instrument    
Amount of redeemable bond issues outstanding   $ 357
Call price   10000.00%
Bond issues with survivor's option | Units   217,000,000
PARRS 1998 Series D Bond    
Debt Instrument    
Amount of redeemable bond issues outstanding $ 256  
PARRS interest rate prior to rate reset 6.75%  
PARRS interest rate after rate reset 2.134%  
Amount of bonds redeemed $ 318  
PARRS 1999 Series A Bond    
Debt Instrument    
Amount of redeemable bond issues outstanding $ 208  
PARRS interest rate prior to rate reset 6.50%  
PARRS interest rate after rate reset 2.216%  
Amount of bonds redeemed $ 316