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FINANCING ARRANGEMENTS - Senior Secured Notes (Details) - USD ($)
12 Months Ended
Apr. 20, 2018
Nov. 21, 2017
Mar. 21, 2017
Dec. 31, 2017
Sep. 30, 2018
May 31, 2018
Mar. 26, 2018
Dec. 18, 2017
Oct. 17, 2017
Sep. 28, 2010
Debt Instrument [Line Items]                    
Redemption price percentage to change in control (as a percent)       101.00%            
Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Repayments of Revolving Credit Facility $ 250,000,000   $ 350,000,000              
Senior Unsecured Notes                    
Debt Instrument [Line Items]                    
Redemption price percentage to change in control (as a percent)       101.00%            
Repurchased principal amount     1,100,000,000       $ 1,500,000,000      
March 2022 Senior Secured Notes                    
Debt Instrument [Line Items]                    
Principal amount     $ 1,250,000,000              
Stated interest rate on debt (as a percent)     6.50%              
March 2024 Senior Secured Notes                    
Debt Instrument [Line Items]                    
Principal amount     $ 2,000,000,000              
Stated interest rate on debt (as a percent)     7.00%              
5.50% Senior Secured Notes due in November 2025 | Senior Secured Notes                    
Debt Instrument [Line Items]                    
Principal amount   $ 750,000,000             $ 1,000,000,000  
Stated interest rate on debt (as a percent)                 5.50%  
6.375% Senior Notes due in October 2020                    
Debt Instrument [Line Items]                    
Repurchased principal amount                 $ 569,000,000  
6.375% Senior Notes due in October 2020 | Senior Unsecured Notes                    
Debt Instrument [Line Items]                    
Repurchased principal amount           $ 104,000,000 $ 411,000,000 $ 1,021,000,000    
7.00% Senior Notes due in October 2020                    
Debt Instrument [Line Items]                    
Stated interest rate on debt (as a percent)                   7.00%
Repurchased principal amount                 $ 431,000,000  
7.00% Senior Notes due in October 2020 | Senior Unsecured Notes                    
Debt Instrument [Line Items]                    
Stated interest rate on debt (as a percent)                   7.00%
Repurchased principal amount               $ 188,000,000    
Series F Tranche B Term Loan Facility                    
Debt Instrument [Line Items]                    
Stated interest rate on debt (as a percent)         5.10%          
Repayments of Revolving Credit Facility   $ 750,000,000