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Segments of Business and Geographic Areas - Operating Profit by Segment of Business (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 03, 2021	Sep. 27, 2020	Oct. 03, 2021	Sep. 27, 2020	Jan. 03, 2021
Segment Reporting Information [Line Items]
Percentage Change in Operating Income Loss	(12.50%)		20.80%
Worldwide income before tax	$ 3,849	$ 4,401	$ 17,940	$ 14,850
Amount prepaid and due to manufacturers			1,200
Reversal of contingent consideration			0	1,148
Restructuring charges	60	68	169	187
Consumer Health
Segment Reporting Information [Line Items]
Litigation expense	1,400	500	1,500	1,200
Restructuring charges			100	100
PHARMACEUTICAL
Segment Reporting Information [Line Items]
Litigation expense	800	1,000	700	1,000
Restructuring charges			100	100
Medical Devices
Segment Reporting Information [Line Items]
Restructuring charges	100	100	200	200
Operating Segments
Segment Reporting Information [Line Items]
Total Segment Operating Income	$ 4,046	4,640	$ 18,592	15,461
Percentage Change in Operating Income Loss	(12.80%)		20.30%
Operating Segments | Consumer Health
Segment Reporting Information [Line Items]
Total Segment Operating Income	$ (636)	191	$ 956	993
Percentage Change in Operating Income Loss			(3.70%)
Amortization	100	100	$ 300	300
Operating Segments | PHARMACEUTICAL
Segment Reporting Information [Line Items]
Total Segment Operating Income	$ 4,259	3,439	$ 13,838	11,787
Percentage Change in Operating Income Loss	23.80%		17.40%
Amortization	$ 800	800	$ 2,500	2,400
Gain (loss) on disposition of assets			600
Unrealized gain (loss) on securities	100		200	200
Operating Segments | Medical Devices
Segment Reporting Information [Line Items]
Total Segment Operating Income	$ 423	1,010	$ 3,798	2,681
Percentage Change in Operating Income Loss	(58.10%)		41.70%
Amortization	$ 300	200	$ 800	700
Unrealized gain (loss) on securities	100		100
In-process research and development expense	900		900
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Total Segment Operating Income	$ 197	239	$ 652	611
Auris Health
Segment Reporting Information [Line Items]
Reversal of contingent consideration					$ 1,148
Other Income | Auris Health | Medical Devices
Segment Reporting Information [Line Items]
Reversal of contingent consideration		$ 200		$ 1,100

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