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SUBSEQUENT EVENTS (Details)
$ in Millions
 12 Months Ended
Apr. 11, 2016
USD ($)
Dec. 31, 2015
USD ($)
Apr. 22, 2016
Apr. 12, 2016
Mar. 27, 2015
Jan. 30, 2015
Dec. 31, 2014
Jul. 12, 2013
Oct. 04, 2012
Mar. 08, 2011
Subsequent Event [Line Items]                    
Stated interest rate (as a percent)   7.50%                
Amended Credit Agreement                    
Subsequent Event [Line Items]                    
Interest coverage ratio   3.00                
Restructuring charges permitted to be added back to EBITDA   $ 125                
Fees and expenses related to issuance of debt permitted to be added back to EBITDA   $ 75                
5.50% Senior Notes due March 2023                    
Subsequent Event [Line Items]                    
Stated interest rate (as a percent)   5.50%       5.50% 5.50%      
5.375% Senior Notes due March 2020                    
Subsequent Event [Line Items]                    
Stated interest rate (as a percent)   5.375%     5.375%   5.375%      
6.375% Senior Notes due in October 2020                    
Subsequent Event [Line Items]                    
Stated interest rate (as a percent)   6.375%         6.375%   6.375%  
7.50% Senior Notes due July 2021                    
Subsequent Event [Line Items]                    
Stated interest rate (as a percent)             7.50% 7.50%    
7.25% Senior Notes due in July 2022                    
Subsequent Event [Line Items]                    
Stated interest rate (as a percent)   7.25%         7.25%     7.25%
Subsequent event | Amended Credit Agreement                    
Subsequent Event [Line Items]                    
Interest coverage ratio 2.75                  
Costs, fees and expenses permitted to be added back to EBITDA $ 175                  
Restructuring charges permitted to be added back to EBITDA 200                  
Fees and expenses related to issuance of debt permitted to be added back to EBITDA $ 150                  
Leverage ratio (less than) 4.50                  
Aggregate cap on acquisitions $ 250                  
Transaction cap, leverage ratio (less than) 4.00                  
Increase in interest rate 1.00%                  
Subsequent event | 5.50% Senior Notes due March 2023                    
Subsequent Event [Line Items]                    
Stated interest rate (as a percent)       5.50%            
Subsequent event | 5.375% Senior Notes due March 2020                    
Subsequent Event [Line Items]                    
Stated interest rate (as a percent)     5.375%              
Subsequent event | 6.375% Senior Notes due in October 2020                    
Subsequent Event [Line Items]                    
Stated interest rate (as a percent)     6.375%              
Subsequent event | 7.50% Senior Notes due July 2021                    
Subsequent Event [Line Items]                    
Stated interest rate (as a percent)     7.50%              
Subsequent event | 7.25% Senior Notes due in July 2022                    
Subsequent Event [Line Items]                    
Stated interest rate (as a percent)     7.25%