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Long-Term Debt (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Apr. 07, 2016
Mar. 31, 2016
Jul. 20, 2015
Apr. 01, 2015
Debt Instrument [Line Items]            
Sale leaseback financing obligation $ 113,000,000 $ 117,000,000        
2014 Revolver 765,000,000 1,000,000,000        
Other 3,000,000 1,000,000        
Total debt 4,324,000,000 4,561,000,000        
Less: current maturities 6,000,000 5,000,000        
Less: debt issuance costs 34,000,000 47,000,000        
Long-term debt, net of current maturities 4,284,000,000 4,509,000,000        
Term Loan [Member]            
Debt Instrument [Line Items]            
Term Loan (1) 1,243,000,000 1,243,000,000   $ 2,035,000,000.000    
Senior Notes [Member] | 6.375% Senior Notes Due 2023 [Member]            
Debt Instrument [Line Items]            
Term Loan (1)           $ 800,000,000.0
Senior notes $ 800,000,000 800,000,000        
Stated interest rate 6.375%         6.375%
Senior Notes [Member] | 5.500% Senior Notes Due 2020 [Member]            
Debt Instrument [Line Items]            
Term Loan (1)         $ 600,000,000.0  
Senior notes $ 600,000,000 600,000,000        
Stated interest rate 5.50%       5.50%  
Senior Notes [Member] | 6.250% Senior Notes Due 2021 [Member]            
Debt Instrument [Line Items]            
Term Loan (1)     $ 800,000,000      
Senior notes $ 800,000,000 800,000,000        
Stated interest rate 6.25%   6.25%      
Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
2014 Revolver $ 765,000,000 $ 1,000,000,000