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Long-Term Debt (Tables)
3 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Summary of Long-term Debt Long-Term debt, net of discounts where applicable, is summarized as follows (in millions):
 
December 31,
2019
 
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
172

 
175

6.25 percent notes due 2024
445

 
444

Financing lease obligation
7

 
7

Borrowings and securitization
145

 
9

Unamortized discount on convertible notes
(32
)
 
(34
)
Subtotal
1,079

 
943

Less: current maturities
(178
)
 
(41
)
Long-term debt
$
901

 
$
902