Fair Value Measurements and Fair Value of Financial Instruments Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - Contingent Consideration [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 53	$ 58	$ 55	$ 37
Acquisitions (including assumed balances)				24
Payments	(1)	(3)	(3)	(3)
Change in fair value included in earnings	(8)		(8)	(3)
Ending Balance	$ 44	$ 55	$ 44	$ 55
Fair Value, Recurring Basis, Unobservable Input Reconciliation, Liability, Gain (Loss), Statement of Income [Extensible List]			us-gaap:SellingGeneralAndAdministrativeExpense