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Segments of Business and Geographic Areas - Operating Profit by Segment of Business (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017
Segment Reporting Information [Line Items]
Percentage Change in Operating Income Loss	4.70%		1.30%
Earnings before provision for taxes on income	$ 4,973	$ 4,748	$ 10,454	$ 10,323
Restructuring charges	57	11	99	96
Asset Impairment Charges			27	270
PHARMACEUTICAL
Segment Reporting Information [Line Items]
Royalty Revenue, Monetization of Royalty				200
Medical Devices
Segment Reporting Information [Line Items]
Restructuring charges	100	100	200	300
Litigation Settlement, Expense	700	400	700	400
Asset Impairment Charges		200
Operating Segments
Segment Reporting Information [Line Items]
Total Segment Operating Income	$ 5,276	5,064	$ 11,069	10,886
Percentage Change in Operating Income Loss	4.20%		1.70%
Operating Segments | CONSUMER
Segment Reporting Information [Line Items]
Total Segment Operating Income	$ 829	658	$ 1,377	1,254
Percentage Change in Operating Income Loss	26.00%		9.80%
Amortization	$ 100	100
Operating Segments | PHARMACEUTICAL
Segment Reporting Information [Line Items]
Total Segment Operating Income	$ 3,651	3,414	$ 7,317	7,077
Percentage Change in Operating Income Loss	6.90%		3.40%
Amortization	$ 800	200	$ 1,500	200
Gain on sale of equity investments		200		200
Operating Segments | Medical Devices
Segment Reporting Information [Line Items]
Total Segment Operating Income	$ 796	992	$ 2,375	2,555
Percentage Change in Operating Income Loss	(19.80%)		(7.00%)
Amortization	$ 300	300	$ 500	500
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Total Segment Operating Income	303	$ 316	615	563
Actelion
Segment Reporting Information [Line Items]
Business Combination, Acquisition Related Costs	100		200
Actelion | PHARMACEUTICAL
Segment Reporting Information [Line Items]
Business Combination, Acquisition Related Costs	100		200	$ 200
NIZORAL [Member] | Operating Segments | CONSUMER
Segment Reporting Information [Line Items]
Gain (Loss) on Disposition of Assets	300		300
PANCREASE [Member] | Operating Segments | PHARMACEUTICAL
Segment Reporting Information [Line Items]
Gain (Loss) on Disposition of Assets	$ 100		$ 100

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