Long-Term Debt (Tables)

6 Months Ended

Mar. 31, 2017

Debt Disclosure [Abstract]

Summary of long-term debt

Long-Term Debt, net of discounts where applicable, is summarized as follows (in millions):

	March 31, 2017			September 30, 2016
4.0 percent convertible notes due 2027(1)(3)	$	142		$	142
7.875 percent convertible notes due 2026(1)(4)	130			129
6.75 percent notes due 2021(2)(5)	271			271
6.25 percent notes due 2024(2)(6)	443			442
Capital lease obligation	14			16
Export financing arrangements and other	—			10
Unamortized discount on convertible notes (7)	(11		)	(14		)
Subtotal	989			996
Less: current maturities	(132		)	(14		)
Long-term debt	$	857		$	982

⁽¹⁾ The 4.0 percent convertible notes due 2027 and 7.875 percent convertible notes due 2026 contain a put and call feature, which allows for earlier redemption beginning in 2019 and 2020, respectively.

⁽²⁾ The 6.75 percent notes and 6.25 percent notes contain a call option, which allows for early redemption.

⁽³⁾ The 4.0 percent convertible notes due 2027 are presented net of $1 million unamortized issuance costs as of March 31, 2017 and September 30, 2016.

⁽⁴⁾ The 7.875 percent convertible notes due 2026 are presented net of $2 million unamortized issuance costs as of March 31, 2017 and September 30, 2016, and $8 million and $9 million original issuance discount as of March 31, 2017 and September 30, 2016, respectively.

⁽⁵⁾ The 6.75 percent notes due 2021 are presented net of $4 millionunamortized issuance costs as of March 31, 2017 and September 30, 2016.

⁽⁶⁾ The 6.25 percent notes due 2024 are presented net of $7 million and $8 million unamortized issuance costs as of March 31, 2017 and September 30, 2016, respectively.

⁽⁷⁾ The carrying amount of the equity component related to convertible debt.