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LONG-TERM DEBT - Repurchase of Debt Securities (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 11, 2015
Sep. 20, 2014
Aug. 20, 2014
Mar. 15, 2014
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
7.875 percent convertible notes due 2026                  
Debt Instrument [Line Items]                  
Stated interest rate         7.875%     7.875% 7.875%
4.0 percent convertible notes due 2027                  
Debt Instrument [Line Items]                  
Stated interest rate         4.00%     4.00% 4.00%
8.125% Notes Due 2015                  
Debt Instrument [Line Items]                  
Stated interest rate         8.125%     8.125%  
Repurchased amount of debt         $ 84     $ 84  
10.625% Notes Due 2018                  
Debt Instrument [Line Items]                  
Stated interest rate         10.625%     10.625%  
Convertible Notes                  
Debt Instrument [Line Items]                  
Carrying amount of equity component         $ 58     $ 58 $ 70
Convertible Notes | 7.875 percent convertible notes due 2026                  
Debt Instrument [Line Items]                  
Extinguishment of debt, amount         $ 25 $ 85   $ 110  
Stated interest rate         7.875%     7.875%  
Redemption price as a percentage of the principal amount to be redeemed         58.00% 64.00%      
Repayments of convertible debt $ 179             $ 179  
Carrying amount of liability component         $ 121     121  
Carrying amount of equity component         58     58  
Net loss on debt extinguishment               (24) (5)
Unamortized discount and deferred issuance costs         14     14  
Redemption premium         10     10  
Repurchased amount of debt $ 110       $ 110     110  
Convertible Notes | 4.0 percent convertible notes due 2027                  
Debt Instrument [Line Items]                  
Extinguishment of debt, amount           $ 4 $ 15 $ 19 $ 38
Stated interest rate         4.00%     4.00% 4.00%
Redemption price as a percentage of the principal amount to be redeemed           5.00% 6.00%   7.00%
Convertible Notes | 8.125% Notes Due 2015                  
Debt Instrument [Line Items]                  
Redemption price as a percentage of the principal amount to be redeemed     7.00%            
Net loss on debt extinguishment   $ (5)              
Redemption premium   6              
Acceleration of unamortized gain on derivative Termination   1              
Repurchased amount of debt   $ 84              
Convertible Notes | 10.625% Notes Due 2018                  
Debt Instrument [Line Items]                  
Redemption price as a percentage of the principal amount to be redeemed       5.00%          
Net loss on debt extinguishment       $ (19)          
Unamortized discount and deferred issuance costs       6          
Redemption premium       13          
Repurchased amount of debt       $ 250