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Debt (Recourse Debt Narrative) (Details) - USD ($)
1 Months Ended 9 Months Ended 12 Months Ended
Aug. 25, 2014
Jun. 16, 2014
May. 20, 2014
Mar. 07, 2014
Apr. 30, 2015
Mar. 31, 2015
Feb. 28, 2014
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jul. 25, 2014
Debt Instrument [Line Items]                        
Increase (Decrease) in Interest Expense, Debt                 $ (64,000,000) $ (48,000,000) $ (34,000,000)  
Loss on extinguishment of debt                 $ 186,000,000 $ 261,000,000 $ 229,000,000  
8% senior unsecured notes due 2017 and 2020 [Member]                        
Debt Instrument [Line Items]                        
Loss on extinguishment of debt               $ 82,000,000        
Senior Notes [Member] | Five Point Five Zero Percent Senior Notes Due 2025 [Domain]                        
Debt Instrument [Line Items]                        
Stated interest rate         5.50%              
Debt face amount         $ 575,000,000              
Recourse Debt                        
Debt Instrument [Line Items]                        
Stated interest rate                 6.75%      
Recourse Debt Covenants and Guarantees:                        
Percentage of capital stock of foreign subsidiaries securing obligations                 65.00%      
Covenants, sale of guarantor or its subsidiaries percentage of proceeds used to repay debt                 60.00%      
Covenants, sale of guarantor or its subsidiaries percentage of proceeds used to repay debt if debt to cash flow is less than 5                 50.00%      
Minimum ratio of operating cash flow to interest charges                 1.3      
Maximum ratio of debt to cash flow                 7.5      
Recourse Debt | Five Point Five Zero Percent Senior Notes Due 2024                        
Debt Instrument [Line Items]                        
Stated interest rate       5.50%                
Debt face amount       $ 750,000,000                
Recourse Debt | Three Percent Above Three Month LIBOR Floating Rate Notes Due June 2019                        
Debt Instrument [Line Items]                        
Debt face amount     $ 775,000,000                  
Basis spread on variable rate     3.00%                  
Unsecured Debt [Member]                        
Debt Instrument [Line Items]                        
Loss on extinguishment of debt               $ 23,000,000        
Unsecured Debt [Member] | 8.0% Senior Notes Due 2017                        
Debt Instrument [Line Items]                        
Debt terminated amount         $ 344,000,000              
Stated interest rate         8.00%              
Unsecured Debt [Member] | 8.0% Senior Notes Due 2020 [Domain]                        
Debt Instrument [Line Items]                        
Debt terminated amount         $ 156,000,000              
Stated interest rate         8.00%              
Unsecured Debt [Member] | 7.75% Senior Notes Due 2015 [Member]                        
Debt Instrument [Line Items]                        
Debt terminated amount           $ 151,000,000            
Stated interest rate           7.75%            
Unsecured Debt [Member] | 9.75% Senior Notes Due 2016 [Member] [Domain]                        
Debt Instrument [Line Items]                        
Debt terminated amount           $ 164,000,000            
Stated interest rate           9.75%            
Recourse Debt                        
Debt Instrument [Line Items]                        
Loss on extinguishment of debt $ 40,000,000                      
Debt Instrument, Notice Call to Retire Notes                       $ 320,000,000
Recourse Debt | 7.75% Senior Notes Due 2014                        
Debt Instrument [Line Items]                        
Debt terminated amount             $ 110,000,000          
Stated interest rate             7.75%          
Recourse Debt | 8.0% Senior Notes Due 2017                        
Debt Instrument [Line Items]                        
Debt terminated amount       $ 625,000,000                
Stated interest rate       8.00%                
Loss on extinguishment of debt       $ 132,000,000                
Recourse Debt | Senior Secured Term Loan LIBOR Plus 2.75% Due 2018                        
Debt Instrument [Line Items]                        
Debt terminated amount   $ 29,000,000 $ 767,000,000                  
Loss on extinguishment of debt     $ 10,000,000                  
Recourse Debt | 7.75% Senior Unsecured Note Due 2015                        
Debt Instrument [Line Items]                        
Debt Instrument, Notice Call to Retire Notes                       160,000,000
Recourse Debt | 9.75% Senior Unsecured Note Due 2016                        
Debt Instrument [Line Items]                        
Debt Instrument, Notice Call to Retire Notes                       $ 160,000,000