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Segments of Business and Geographic Areas - Operating Profit by Segment of Business (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 04, 2021	Mar. 29, 2020
Segment Reporting Information [Line Items]
Percentage Change in Operating Income Loss	14.10%
Earnings before provision for taxes on income	$ 7,429	$ 6,509
Amount prepaid and due to manufacturers	1,000
Reversal of contingent consideration	0	983
Restructuring charges	53	58
PHARMACEUTICAL
Segment Reporting Information [Line Items]
Litigation expense		100
Medical Devices
Segment Reporting Information [Line Items]
Restructuring charges	100	100
Operating Segments
Segment Reporting Information [Line Items]
Total Segment Operating Income	$ 7,640	6,629
Percentage Change in Operating Income Loss	15.30%
Operating Segments | Consumer Health
Segment Reporting Information [Line Items]
Total Segment Operating Income	$ 788	770
Percentage Change in Operating Income Loss	2.30%
Amortization	$ 100	100
Operating Segments | PHARMACEUTICAL
Segment Reporting Information [Line Items]
Total Segment Operating Income	$ 5,223	3,834
Percentage Change in Operating Income Loss	36.20%
Amortization	$ 900	800
Gain (Loss) on Disposition of Assets	600
Unrealized Gain (Loss) on Securities		(300)
Operating Segments | Medical Devices
Segment Reporting Information [Line Items]
Total Segment Operating Income	$ 1,629	2,025
Percentage Change in Operating Income Loss	(19.60%)
Amortization	$ 300	200
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Total Segment Operating Income	$ 211	120
Auris Health
Segment Reporting Information [Line Items]
Reversal of contingent consideration		983
Other Income | Auris Health | Medical Devices
Segment Reporting Information [Line Items]
Reversal of contingent consideration		$ 1,000

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