Allowance For Doubtful Accounts (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Year	$ 102	$ 117
Provision charged to expense	30	8
Accounts Receivable, Allowance for Credit Loss, Writeoff	(18)	(10)
Acquisitions, currency translation and other	(2)	(2)
Balance at End of Period	113	$ 113
Cumulative Effect, Period of Adoption, Adjustment [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Year	$ 1