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DEBT - Schedule of long-term debt (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Feb. 20, 2020
May 31, 2015
Debt        
Total Long-Term Debt $ 4,860,000,000 $ 4,977,000,000   $ 6,800,000,000
2014 Revolving Credit Facility (Shared First Priority Lien)        
Debt        
Total Long-Term Debt $ 507,000,000 $ 518,000,000    
2014 Revolving Credit Facility (Shared First Priority Lien) | Applicable margin on LIBOR loans | Minimum        
Debt        
Interest rate added to variable rate basis 3.25% 3.25%    
2014 Revolving Credit Facility (Shared First Priority Lien) | Applicable margin on LIBOR loans | Maximum        
Debt        
Interest rate added to variable rate basis 4.00% 4.00%    
2014 Revolving Credit Facility (Shared First Priority Lien) | Applicable margin on Alternate Base Rate loans | Minimum        
Debt        
Interest rate added to variable rate basis 2.25% 2.25%    
2014 Revolving Credit Facility (Shared First Priority Lien) | Applicable margin on Alternate Base Rate loans | Maximum        
Debt        
Interest rate added to variable rate basis 3.00% 3.00%    
2017 Credit Agreement (Shared First Priority Lien)        
Debt        
Total Long-Term Debt $ 1,300,000,000 $ 1,300,000,000    
Period before maturity of the 2016 Credit Agreement notes that triggers accelerated payment 91 days      
Outstanding amount of 2016 Credit Agreement notes that triggers accelerated payment $ 100,000,000      
2017 Credit Agreement (Shared First Priority Lien) | Applicable margin on LIBOR loans        
Debt        
Interest rate added to variable rate basis 4.75% 4.75%    
2017 Credit Agreement (Shared First Priority Lien) | Applicable margin on Alternate Base Rate loans        
Debt        
Interest rate added to variable rate basis 3.75% 3.75%    
2016 Credit Agreement (Shared First Priority Lien)        
Debt        
Total Long-Term Debt $ 1,000,000,000 $ 1,000,000,000    
2016 Credit Agreement (Shared First Priority Lien) | Applicable margin on LIBOR loans        
Debt        
Interest rate added to variable rate basis 10.375% 10.375%    
2016 Credit Agreement (Shared First Priority Lien) | Applicable margin on Alternate Base Rate loans        
Debt        
Interest rate added to variable rate basis 9.375% 9.375%    
Second Lien Notes (Second Priority Lien)        
Debt        
Total Long-Term Debt $ 1,809,000,000 $ 1,815,000,000    
Debt instrument, interest rate, stated percentage 8.00% 8.00%    
Principal amount due by June 2021 $ 286,000,000      
Principal amount due by December 2021 57,000,000      
Principal amount due by June 2022 60,000,000      
Principal amount due by December 2022 1,406,000,000      
Senior Notes (Unsecured) | 5% Senior Notes due 2020        
Debt        
Total Long-Term Debt $ 0 $ 100,000,000    
Debt instrument, interest rate, stated percentage 5.00% 5.00%    
Senior Notes (Unsecured) | 5.5% Notes Due 2021        
Debt        
Total Long-Term Debt $ 100,000,000 $ 100,000,000    
Debt instrument, interest rate, stated percentage 5.50% 5.50% 5.50%  
Senior Notes (Unsecured) | 6% Senior Notes due 2024        
Debt        
Total Long-Term Debt $ 144,000,000 $ 144,000,000    
Debt instrument, interest rate, stated percentage 6.00% 6.00% 6.00%