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Long-Term Debt - Issuance of Debt Securities - 2024 Notes (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 11, 2015
Mar. 15, 2014
Mar. 15, 2014
Feb. 13, 2014
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2015
Jun. 30, 2014
Feb. 28, 2015
Sep. 30, 2014
Debt Instrument [Line Items]                    
Proceeds from debt issuance             $ 225,000,000 $ 225,000,000    
Repayment of notes             $ (159,000,000) $ (308,000,000)    
6.25 percent notes due 2024                    
Debt Instrument [Line Items]                    
Proceeds from debt issuance       $ 225,000,000            
Interest rate         6.25%   6.25%     6.25%
Long-term debt outstanding         $ 450,000,000   $ 450,000,000     $ 225,000,000
6.25 percent notes due 2024 | Redemption period, equity clawback                    
Debt Instrument [Line Items]                    
Redemption price, percentage             106.25%      
10.625% Notes Due 2018                    
Debt Instrument [Line Items]                    
Redemption price, percentage   105.313%                
Notes | 6.25 percent notes due 2024                    
Debt Instrument [Line Items]                    
Principal amount $ 225,000,000     $ 225,000,000            
Term of notes       10 years            
Issuance price percentage of the debt instrument       100.00%            
Long-term debt outstanding 450,000,000                  
Notes | 6.25 percent notes due 2024 | 2019                    
Debt Instrument [Line Items]                    
Redemption price, percentage             103.125%      
Notes | 6.25 percent notes due 2024 | 2020                    
Debt Instrument [Line Items]                    
Redemption price, percentage             102.083%      
Notes | 6.25 percent notes due 2024 | 2021                    
Debt Instrument [Line Items]                    
Redemption price, percentage             101.042%      
Notes | 6.25 percent notes due 2024 | 2022 and thereafter                    
Debt Instrument [Line Items]                    
Redemption price, percentage             100.00%      
Notes | 6.25 percent notes due 2024 | Redemption period, equity clawback                    
Debt Instrument [Line Items]                    
Redemption price, principal amount redeemable             $ 79,000,000      
Redemption, principal amount outstanding, minimum         $ 146,000,000   $ 146,000,000      
Redemption, written notice period             90 days      
Notes | 10.625% Notes Due 2018                    
Debt Instrument [Line Items]                    
Principal amount of convertible notes repurchased   $ 250,000,000 $ 250,000,000              
Interest rate         10.625%   10.625%      
Repurchase price percentage     5.00%              
Net loss on debt extinguishment     $ 19,000,000              
Unamortized discount and deferred issuance costs   6,000,000 6,000,000              
Debt redemption premium   $ 13,000,000 $ 13,000,000              
Corporate Debt Securities | 6.25 percent notes due 2024 | Change in control redemption                    
Debt Instrument [Line Items]                    
Redemption price, percentage             101.00%      
Corporate Debt Securities | 10.625% Notes Due 2018                    
Debt Instrument [Line Items]                    
Principal amount of convertible notes repurchased       $ 250,000,000            
Interest rate       10.625%            
Convertible Notes Payable | 7.875% Convertible Notes Due 2026                    
Debt Instrument [Line Items]                    
Principal amount of convertible notes repurchased 85,000,000                  
Interest rate         7.875%   7.875%     7.875%
Repurchase amount, debt 139,000,000           $ 139,000,000      
Long-term debt outstanding         $ 152,000,000   152,000,000     $ 229,000,000
Repurchase price percentage         64.00%          
Liability component of convertible notes 93,000,000                  
Equity component of convertible notes $ 46,000,000                  
Net loss on debt extinguishment         $ 19,000,000          
Unamortized discount and deferred issuance costs         11,000,000   11,000,000      
Debt redemption premium         $ 8,000,000   $ 8,000,000      
Convertible Notes Payable | 4.0 percent convertible notes due 2027                    
Debt Instrument [Line Items]                    
Interest rate         4.00%   4.00%   4.00% 4.00%
Repurchase amount, debt             $ 4,000,000      
Long-term debt outstanding         $ 143,000,000   143,000,000     $ 162,000,000
Repayment of notes         $ (4,000,000) $ (15,000,000) (19,000,000)      
Repurchase price percentage         4.50% 6.00%        
Net loss on debt extinguishment             $ 1,000,000