Restructuring Reserves (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Restructuring Reserve [Roll Forward]
Beginning balance				$ 80
Cumulative Effect of Accounting Change	[1]			(28)
Costs incurred	[2]			23
Reserves reversed	[3]			(2)
Payments				(34)
Ending balance		$ 39		39
Loss (Gain) on Divestiture of Businesses				(505)	$ 0
Impairment of Acquired In-process Research and Development				6
Restructuring and other (income) costs, net		(484)	$ 17	(473)	$ 62
Restructuring and Related Costs, Other Costs (Income), Net				$ 2
Restructuring Reserve, Expected Final Year of Payments				2019
Charges For Cash Compensation Contractually Due To Employees Of Acquired Business [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other (income) costs, net				$ 3
Severance [Member]
Restructuring Reserve [Roll Forward]
Beginning balance				34
Costs incurred				13
Reserves reversed	[3]			(1)
Payments				(20)
Ending balance		26		26
Abandonment of Excess Facilities [Member]
Restructuring Reserve [Roll Forward]
Beginning balance				42
Cumulative Effect of Accounting Change	[1]			(28)
Costs incurred				3
Reserves reversed	[3]			(1)
Payments				(7)
Ending balance		9		9
Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Beginning balance	[4]			4
Costs incurred	[4]			7
Payments	[4]			(7)
Ending balance	[4]	$ 4		$ 4

[1] Impact of adopting new lease accounting guidance on January 1, 2019.

[2] Excludes $505 million gain on the sale of the company's Anatomical Pathology business; $6 million of impairment of acquired in-process research and development; $3 million of compensation due to employees on the date of acquisition; and $2 million of other non-cash charges, net.

[3] Represents reductions in cost of plans.

[4] Other includes relocation and moving expenses associated with facility consolidations, as well as employee retention costs which are accrued ratably over the period through which employees must work to qualify for a payment.