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	9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 35	$ 6
Acquisitions	11	12
Payments	(8)	(1)
Change in fair value included in earnings	(4)	26
Ending Balance	$ 34	$ 43