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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
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Segment Reporting Information [Line Items]
Percentage Change In Sales By Geographic Area	(1.30%)		(0.60%)
Sales to customers	$ 20,562	$ 20,830	$ 40,583	$ 40,839
Percentage Change in Operating Income Loss	41.60%		9.70%
Earnings before provision for taxes on income	$ 7,041	4,973	$ 11,463	10,454
In-process research and development			890	0
Restructuring charges	57	57	93	99
CONSUMER
Segment Reporting Information [Line Items]
Sales to customers	3,544	3,504	6,862	6,902
Litigation expense	200		200
PHARMACEUTICAL
Segment Reporting Information [Line Items]
Sales to customers	10,529	10,354	20,773	20,198
In-process research and development			900
Litigation expense			400
Research and Development Expense			300
Medical Devices
Segment Reporting Information [Line Items]
Sales to customers	6,489	6,972	12,948	13,739
Restructuring charges	100	100	100	200
Litigation expense	200	700	300	700
Operating Segments
Segment Reporting Information [Line Items]
Total Segment Operating Income	$ 7,272	5,276	$ 11,841	11,069
Percentage Change in Operating Income Loss	37.80%		7.00%
Operating Segments | CONSUMER
Segment Reporting Information [Line Items]
Total Segment Operating Income	$ 406	829	$ 1,147	1,377
Percentage Change in Operating Income Loss	(51.00%)		(16.70%)
Amortization	$ 100	100	$ 200	100
Gain (Loss) on Disposition of Assets		300		300
Operating Segments | PHARMACEUTICAL
Segment Reporting Information [Line Items]
Total Segment Operating Income	$ 3,677	3,651	$ 6,008	7,317
Percentage Change in Operating Income Loss	0.70%		(17.90%)
Amortization	$ 800	800	$ 1,600	1,500
Gain (Loss) on Disposition of Assets		100		100
Unrealized Gain (Loss) on Securities	200		300
Operating Segments | Medical Devices
Segment Reporting Information [Line Items]
Total Segment Operating Income	3,189	796	$ 4,686	2,375
Percentage Change in Operating Income Loss			97.30%
Amortization	200	300	$ 500	500
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Total Segment Operating Income	231	303	378	615
Ci:z Holdings Co. Ltd. | CONSUMER
Segment Reporting Information [Line Items]
Gain on sale of equity investments			300
Actelion | PHARMACEUTICAL
Segment Reporting Information [Line Items]
Acquisition related costs	$ 100	100	$ 100	200
United States
Segment Reporting Information [Line Items]
Percentage Change In Sales By Geographic Area	(2.20%)		(0.30%)
Sales to customers	$ 10,403	10,640	$ 20,532	20,591
United States | CONSUMER
Segment Reporting Information [Line Items]
Sales to customers	1,537	1,476	2,975	2,912
United States | PHARMACEUTICAL
Segment Reporting Information [Line Items]
Sales to customers	5,783	5,899	11,365	11,253
United States | Medical Devices
Segment Reporting Information [Line Items]
Sales to customers	$ 3,083	3,265	$ 6,192	6,426
Europe
Segment Reporting Information [Line Items]
Percentage Change In Sales By Geographic Area	(1.60%)		(2.80%)
Sales to customers	$ 4,733	4,810	$ 9,342	9,607
Western Hemisphere, excluding U.S.
Segment Reporting Information [Line Items]
Percentage Change In Sales By Geographic Area	(5.50%)		(4.80%)
Sales to customers	$ 1,455	1,540	$ 2,958	3,107
Asia-Pacific, Africa
Segment Reporting Information [Line Items]
Percentage Change In Sales By Geographic Area	3.40%		2.90%
Sales to customers	$ 3,971	$ 3,840	$ 7,751	$ 7,534
ADVANCED | Operating Segments | Medical Devices
Segment Reporting Information [Line Items]
Gain (Loss) on Disposition of Business	$ 2,000		$ 2,000

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