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LONG-TERM DEBT (Tables)
 12 Months Ended
Sep. 30, 2015
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,
 
2015
 
2014 (3)
4.625 percent convertible notes due 2026 (1)
55

 
55

4.0 percent convertible notes due 2027 (net of $1 and $2 unamortized issuance costs respectively) (1)
142

 
160

7.875 percent convertible notes due 2026 (net of $3 and $5 unamortized issuance costs respectively, and $10 and $21 original issuance discount, respectively) (1)
127

 
224

6.75 percent notes due 2021 (net of $5 and $5 unamortized issuance costs respectively) (2)
270

 
270

6.25 percent notes due 2024 (net of $8 and $5 unamortized issuance costs respectively) (2)
442

 
220

Capital lease obligation
17

 
26

Export financing arrangements
18

 
31

Unamortized discount on convertible notes
(20
)
 
(31
)
Subtotal
1,051

 
955

Less: current maturities
(15
)
 
(7
)
Long-term debt
$
1,036

 
$
948


(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 6.25 percent notes contain a call option, which allows for early redemption.
(3)
Prior year amounts have been recast to reflect the early adoption of ASU 2015-03, Interest — Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs.
Debt instrument redemption summary
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%
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%
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,
2015
 
September 30,
2014
Principal amount of convertible notes
$
338

 
$
467

Unamortized discount on convertible notes
(30
)
 
(52
)
Net carrying value
$
308

 
$
415
Summary of convertible debt
The following table summarizes other information related to the convertible notes:
 
 
Convertible Notes
 
2026
 
2027
 
2013
Total amortization period for debt discount (in years):
10

 
12

 
8

Remaining amortization period for debt discount (in years):
1

 
4

 
5

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,
 
2015
 
2014
 
2013
Contractual interest coupon
$
26

 
$
30

 
$
29

Amortization of debt discount
8

 
9

 
8

Repurchase of convertible notes
24

 
5

 
5

Total
$
58

 
$
44

 
$
42
Maturities of long-term debt
As of September 30, 2015, the company is contractually obligated to make payments as follows (in millions):
 
Total
 
2016
 
2017
 
2018
 
2019
 
2020
 
Thereafter (2)
Total debt (1)
$
1,098

 
$
15

 
$
13

 
$
3

 
$
1

 
$
1

 
$
1,065


(1)
Total debt excludes unamortized discount on convertible notes of $20 million, unamortized issuance costs of $17 million, and original issuance discount of $10 million.
(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, 2015, the future minimum lease payments for noncancelable capital leases with initial terms in excess of one year were as follows:
 
Total
 
2016
 
2017
 
2018
 
2019
 
2020
 
Thereafter 
Capital lease obligation
$
23

 
$
6

 
$
6

 
$
4

 
$
2

 
$
1

 
$
4

Less amounts representing interest
(6
)
 
(2
)
 
(1
)
 
(1
)
 
(1
)
 
—

 
(1
)
Principal on capital lease
$
17

 
$
4

 
$
5

 
$
3

 
$
1

 
$
1

 
$
3