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Long-Term Debt (Details) - USD ($)
Mar. 31, 2018
Jan. 23, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Sale leaseback financing obligation $ 111,000,000   $ 113,000,000
Line of credit 0   765,000,000
Capital Lease Obligations 2,000,000   3,000,000
Total debt 2,313,000,000   4,324,000,000
Less: current maturities 5,000,000   6,000,000
Less: debt issuance costs 25,000,000   34,000,000
Long-term debt, net of current maturities 2,283,000,000   4,284,000,000
Senior Notes [Member]      
Debt Instrument [Line Items]      
Term Loan (1)   $ 2,200,000,000.0  
Term Loan [Member]      
Debt Instrument [Line Items]      
Term Loan (1) [1]     1,243,000,000
2014 Revolver [Member]      
Debt Instrument [Line Items]      
Line of credit 0   765,000,000
Four Point Eight Seven Five Percentage Senior Notes Due Two Thousand Twenty Three [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Term Loan (1)   1,000,000,000.0  
Senior Notes 1,000,000,000   0
Five Point Five Zero Zero Percentage Senior Notes Due Two Thousand Twenty Six [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Term Loan (1)   800,000,000  
Senior Notes 800,000,000   0
Five Point Eight Seven Five Percentage Senior Notes Due Two Thousand Twenty Eight [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Term Loan (1)   $ 400,000,000  
Senior Notes $ 400,000,000   $ 0
[1] (1)The Term Loan was repaid in full and terminated on January 23, 2018.