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SENIOR NOTES PAYABLE (Tables)
9 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Schedule of Long-term Debt
The following table summarizes our senior notes payable.
$ in millionsJune 30, 2021September 30, 2020
4.65% senior notes, due 2030
$500 $500 
4.95% senior notes, due 2046
800 800 
3.750% senior notes, due 2051
750 — 
5.625% senior notes, due 2024
 250 
3.625% senior notes, due 2026
 500 
Total principal amount2,050 2,050 
Unaccreted premium5 10 
Unamortized debt issuance costs(18)(15)
Total senior notes payable$2,037 $2,045