Basis of Presentation, Nature of Operations and Summary of Significant Accounting Policies Presentation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 28, 2019
Statement Presentation [Line Items]
CARES Act Deferred Remittance of Employer Payroll Tax	$ 76
CARES Act Deferred Remittance of Employer Payroll Tax included in "Accrued payroll and tax withholdings" and "Other liabilities"	38
Postemployment Benefits, Period Expense	$ 20	$ 52
Description of New Accounting Pronouncements Not yet Adopted [Text Block]	The FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting in March 2020 and ASU 2021-01, Reference Rate Reform (Topic 848): Scope in January 2021. Such guidance provides optional financial reporting alternatives to reduce the cost and complexity associated with the accounting for contracts and hedging relationships affected by reference rate reform, such as the upcoming discontinuance of LIBOR. The accommodations within this guidance may be applied prospectively from the beginning of our 2020 first quarter through December 31, 2022. We are currently evaluating the effect that this guidance may have on our contracts that reference LIBOR, specifically, our Third Amended and Restated Credit Agreement (as amended, the "Credit Agreement") and related interest rate swap. As of the date of this filing, we have not elected to apply any of the provisions of this guidance
Accounting Standards Update 2018-18 [Member]
Statement Presentation [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description	Collaborative Arrangements. In November 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2018-18, Collaborative Arrangements (Topic 808): Clarifying the Interaction between Topic 808 and Topic 606, which clarifies when transactions between participants in a collaborative arrangement are within the scope of the FASB's recent revenue standard (Topic 606). Such guidance clarifies revenue recognition and financial statement presentation for transactions between collaboration participants. We adopted ASU 2018-18 in the first quarter of 2020. Such guidance did not have an impact on our consolidated financial statements and related disclosures.
Employee Separation Costs [Member]
Statement Presentation [Line Items]
Restructuring Charges	$ 22	34
Contract Termination [Member]
Statement Presentation [Line Items]
Restructuring Charges	$ 29	$ 66