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Debt and Other Obligations Debt and Other Obligations - Put and Call Options (Details)
$ in Millions
 12 Months Ended
Sep. 30, 2019
USD ($)
Debt Instrument  
Amount of redeemable bond issues outstanding $ 357
Call price 100.00%
Bond issues with survivor's option 217
Amount of bonds redeemed $ 217
PARRS 1998 Series D Bond  
Debt Instrument  
Amount of redeemable bond issues outstanding $ 274
PARRS interest rate prior to rate reset 6.75%
PARRS interest rate after rate reset 3.55%
Amount of bonds redeemed $ 301
PARRS 1999 Series A Bond  
Debt Instrument  
Amount of redeemable bond issues outstanding $ 232
PARRS interest rate prior to rate reset 6.50%
PARRS interest rate after rate reset 3.36%
Amount of bonds redeemed $ 293