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SENIOR NOTES PAYABLE (Tables)
9 Months Ended
Jun. 30, 2022
Debt Disclosure [Abstract]  
Schedule of Borrowings
The following table summarizes our senior notes payable.
$ in millionsJune 30, 2022September 30, 2021
4.65% senior notes, due 2030
$500 $500 
4.95% senior notes, due 2046
800 800 
3.75% senior notes, due 2051
750 750 
Total principal amount2,050 2,050 
Unaccreted premiums/(discounts)6 
Unamortized debt issuance costs(18)(18)
Total senior notes payable$2,038 $2,037