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SENIOR NOTES PAYABLE (Tables)
9 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt
The following table summarizes our senior notes payable.
$ in millionsJune 30, 2020September 30, 2019
5.625% senior notes, due 2024
$250  $250  
3.625% senior notes, due 2026
500  500  
4.65% senior notes, due 2030
500  —  
4.95% senior notes, due 2046
800  800  
Total principal amount2,050  1,550  
Unaccreted premium/(discount)
 11  
Unamortized debt issuance costs
(15) (11) 
Total senior notes payable
$2,044  $1,550