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SENIOR NOTES PAYABLE (Tables)
12 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Senior Notes Payable
The following table summarizes our senior notes payable.
September 30,
$ in millions20202019
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)
10 11 
Unamortized debt issuance costs
(15)(11)
Total senior notes payable
$2,045 $1,550