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		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 37	$ 41	$ 37	$ 35
Acquisitions (including assumed balances)	24	0	24	11
Payments	0	0	0	(5)
Change in fair value included in earnings	(3)	(1)	(3)	(1)
Ending Balance	$ 58	$ 40	$ 58	$ 40