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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Gross amount of debt extinguished.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Long-Term Debt - Credit Facilities (Details) - USD ($)			3 Months Ended	9 Months Ended
Long-Term Debt - Credit Facilities (Details) - USD ($)	May 31, 2018	May 30, 2018	Jun. 30, 2018	Sep. 29, 2018	Sep. 30, 2017	Dec. 31, 2017
Line of Credit Facility [Line Items]
Long-term debt				$ 1,912,000,000		$ 2,249,000,000
Accelerated amortization of debt issuance costs			$ 6,000,000	1,000,000	$ 49,000,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Long-term debt				473,000,000		275,000,000
Letters of credit				$ 5,000,000
Average interest rate				3.45%
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
Funds available for other borrowing				$ 795,000,000
Term Loan \| Term Loan A
Line of Credit Facility [Line Items]
Long-term debt	670,000,000			608,000,000		679,000,000
Debt issuance costs				$ 2,000,000
Percentage bearing variable interest, percentage rate				3.99%
Term Loan \| Term Loan B
Line of Credit Facility [Line Items]
Long-term debt				$ 695,000,000		$ 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%