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LONG-TERM DEBT (Tables)
 12 Months Ended
Sep. 30, 2014
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Long-Term Debt, net of discounts where applicable, is summarized as follows (in millions):
 
 
September 30,
 
2014
 
2013
8.125 percent notes due 2015
$
—

 
$
84

10.625 percent notes due 2018 (net of issuance discount of $3)
—

 
247

4.625 percent convertible notes due 2026 (1)
55

 
55

4.0 percent convertible notes due 2027 (1)
162

 
200

7.875 percent convertible notes due 2026 (net of issuance discount of $21 and $23, respectively) (1)
229

 
227

6.75 percent notes due 2021 (2)
275

 
275

6.25 percent notes due 2024 (2)
225

 
—

Term loan
—

 
45

Capital lease obligation
26

 
28

Export financing arrangements
31

 
18

Unamortized gain on interest rate swap termination
—

 
2

Unamortized discount on convertible notes
(31
)
 
(43
)
Subtotal
972

 
1,138

Less: current maturities
(7
)
 
(13
)
Long-term debt
$
965

 
$
1,125


(1)
The 4.625 percent, 4.0 percent and 7.875 percent convertible notes contain a put and call feature, which allows for earlier redemption beginning in 2016, 2019 and 2020, respectively.
(2)
The 6.75 percent,and the 6.25 percent notes contain a call option, which allows for early redemption.
Debt instrument redemption summary
On or after June 15, 2016, the company may redeem, at its option, from time to time, the 2021 Notes, in whole or in part, at the redemption prices (expressed as percentages of the principal amount of the 2021 Notes to be redeemed) set forth below, plus accrued and unpaid interest, if any, if redeemed during the 12-month period beginning on June 15 of the years indicated below:
Year
     
Redemption Price
2016
 
105.063%
2017
 
103.375%
2018
 
101.688%
2019 and thereafter
 
100.000%
On or after February 15, 2019, the company may redeem, at its option, from time to time, the 2024 Notes, in whole or in part, at the redemption prices (expressed as percentages of the principal amount of the 2024 Notes to be redeemed) set forth below, plus accrued and unpaid interest, if any, if redeemed during the 12-month period beginning on February 15 of the years indicated below:
Year
     
Redemption Price
2019
 
103.125%
2020
 
102.083%
2021
 
101.042%
2022 and thereafter
 
100.000%
Schedule of amortization periods and effective interest rates on convertible notes
The following table summarizes the principal amounts and related unamortized discount on all convertible notes (in millions):
 
 
September 30,
2014
 
September 30,
2013
Principal amount of convertible notes
$
467

 
$
505

Unamortized discount on convertible notes
(52
)
 
(66
)
Net carrying value
$
415

 
$
439
Summary of convertible debt
The following table summarizes other information related to the convertible notes:
 
 
2026 convertible notes
 
2027 convertible notes
 
2013 convertible notes
Total amortization period for debt discount (in years):
10

 
12

 
8

Remaining amortization period for debt discount (in years):
2

 
5

 
6

Effective interest rates on convertible notes:
7.0
%
 
7.7
%
 
10.9
%
Schedule of interest costs on convertible notes
The following table summarizes interest costs recognized on convertible notes (in millions):
 
 
Year Ended September 30,
 
2014
 
2013
 
2012
Contractual interest coupon
$
30

 
$
29

 
$
22

Amortization of debt discount
9

 
8

 
10

Repurchase of convertible notes
5

 
5

 
—

Total
$
44

 
$
42

 
$
32
Maturities of long-term debt
As of September 30, 2014, the company is contractually obligated to make payments as follows (in millions):
 
Total
 
2015
 
2016
 
2017
 
2018
 
2019
 
Thereafter (2)
Total debt (1)
$
1,024

 
$
7

 
$
22

 
$
17

 
$
4

 
$
2

 
$
972

(1)
Total debt excludes the unamortized discount on convertible notes of $31 million and discount of $21 million on the 7.875 percent notes due March 1, 2026.
(2)
Includes the company's 4.625 percent, 4.0 percent and 7.875 percent convertible notes, which contain a put and call feature that allows for earlier redemption beginning in 2016, 2019 and 2020, respectively.
Future minimum lease payments for capital leases
As of September 30, 2014, the future minimum lease payments for noncancelable capital leases with initial terms in excess of one year were as follows:
 
Total
 
2015
 
2016
 
2017
 
2018
 
2019
 
Thereafter 
Capital lease obligation
$
35

 
$
7

 
$
7

 
$
6

 
$
4

 
$
3

 
$
8

Less amounts representing interest
(9
)
 
(2
)
 
(2
)
 
(1
)
 
(1
)
 
(1
)
 
(2
)
Principal on capital lease
$
26

 
$
5

 
$
5

 
$
5

 
$
3

 
$
2

 
$
6