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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.

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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