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SENIOR NOTES PAYABLE (Tables)
6 Months Ended
Mar. 31, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt

The following table summarizes our senior notes payable.
$ in millions
 
March 31, 2020
 
September 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 amount
 
2,050

 
1,550

Unaccreted premium/(discount)
 
10

 
11

Unamortized debt issuance costs
 
(16
)
 
(11
)
Total senior notes payable
 
$
2,044

 
$
1,550