Long-Term Debt - Credit Facilities (Details) - USD ($)			3 Months Ended
	May 31, 2018	May 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Line of Credit Facility [Line Items]
Long-term debt			$ 2,014,000,000	$ 2,249,000,000
Accelerated amortization of debt issuance costs			6,000,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Long-term debt			433,000,000	275,000,000
Letters of credit			$ 5,000,000
Average interest rate			3.91%
Revolving Credit Facility | Amended and Restated Credit Agreement
Line of Credit Facility [Line Items]
Revolving credit facility maximum borrowing capacity	$ 800,000,000	$ 500,000,000
Line of Credit Facility, Remaining Borrowing Capacity			$ 795,000,000
Term Loan | Term Loan A
Line of Credit Facility [Line Items]
Long-term debt	670,000,000		653,000,000	679,000,000
Debt issuance costs			$ 2,000,000
Percentage bearing variable interest, percentage rate			3.84%
Term Loan | Term Loan B
Line of Credit Facility [Line Items]
Long-term debt			$ 810,000,000	$ 1,160,000,000
Early extinguishment of debt	$ 300,000,000
Debt issuance costs			$ 1,000,000
Percentage bearing variable interest, percentage rate			4.06%
Term Loan | Term Loan B | Floor
Line of Credit Facility [Line Items]
Percentage bearing variable interest, percentage rate			2.75%
LIBOR | Amended and Restated Credit Agreement
Line of Credit Facility [Line Items]
Rate spread	1.75%	2.00%