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DEBT - Schedule of long-term debt (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Debt    
Long-term debt $ 5,108 $ 5,306
2014 Revolving Credit Facility (Shared First Priority Lien)    
Debt    
Long-term debt $ 342 $ 363
2014 Revolving Credit Facility (Shared First Priority Lien) | Applicable margin on LIBOR loans | Minimum    
Debt    
Interest rate added to variable rate basis (as a percent) 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 (as a percent) 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 (as a percent) 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 (as a percent) 3.00% 3.00%
2017 Credit Agreement (Shared First Priority Lien)    
Debt    
Long-term debt $ 1,300 $ 1,300
2017 Credit Agreement (Shared First Priority Lien) | 91 days prior to maturity of 2016 Credit Agreement    
Debt    
Period before maturity of the 2016 Credit Agreement notes that triggers accelerated payment 91 days 91 days
Outstanding amount of 2016 Credit Agreement notes that triggers accelerated payment $ 100 $ 100
2017 Credit Agreement (Shared First Priority Lien) | Applicable margin on LIBOR loans    
Debt    
Interest rate added to variable rate basis (as a percent) 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 (as a percent) 3.75% 3.75%
2016 Credit Agreement (Shared First Priority Lien)    
Debt    
Long-term debt $ 1,000 $ 1,000
2016 Credit Agreement (Shared First Priority Lien) | Applicable margin on LIBOR loans    
Debt    
Interest rate added to variable rate basis (as a percent) 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 (as a percent) 9.375% 9.375%
Second Lien Notes (Second Priority Lien)    
Debt    
Long-term debt $ 2,122 $ 2,250
Debt instrument interest rate stated percentage 8.00% 8.00%
Principal amount due by June 2021 $ 335  
Principal amount due by December 2021 67  
Principal amount due by June 2022 70  
Senior Notes (Unsecured) | 5% Notes Due 2020    
Debt    
Long-term debt $ 100 $ 100
Debt instrument interest rate stated percentage 5.00% 5.00%
Senior Notes (Unsecured) | 5.5% Notes Due 2021    
Debt    
Long-term debt $ 100 $ 100
Debt instrument interest rate stated percentage 5.50% 5.50%
Senior Notes (Unsecured) | 6% Senior Notes due 2024    
Debt    
Long-term debt $ 144 $ 193
Debt instrument interest rate stated percentage 6.00% 6.00%