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Long-Term Debt (Tables)
6 Months Ended
Mar. 31, 2020
Debt Disclosure [Abstract]  
Summary of Long-term Debt Long-Term debt, net of discounts where applicable, is summarized as follows (in millions):
 
March 31,
2020
 
September 30,
2019
3.25 percent convertible notes due 2037
$
319

 
$
319

7.875 percent convertible notes due 2026
23

 
23

Term loan due 2024
171

 
175

6.25 percent notes due 2024
445

 
444

Financing lease obligation
6

 
7

Borrowings and securitization
408

 
9

Unamortized discount on convertible notes
(31
)
 
(34
)
Subtotal
1,341

 
943

Less: current maturities
(138
)
 
(41
)
Long-term debt
$
1,203

 
$
902