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Segments of Business and Geographic Areas - Schedule of Segment Reporting Information (Details) $ in Millions	12 Months Ended
	Jan. 01, 2023 USD ($) Segment	Jan. 02, 2022 USD ($) Segment	Jan. 03, 2021 USD ($) Segment
Segment Reporting Information [Line Items]
Earnings before provision for taxes on income	$ 21,725	$ 22,776	$ 16,497
Identifiable Assets	187,378	182,018
Results of Operations, Income before Income Taxes		200	200
Additions to Property, Plant & Equipment	4,009	3,652	3,347
Depreciation and Amortization	6,970	7,390	7,231
Sales to Customers	$ 94,943	$ 93,775	$ 82,584
Number of segments | Segment	3	3	3
Charges	$ 321	$ 252	$ 247
In-process research and development	783	900	181
Contingent consideration reversal	0	0	$ (1,148)
Property, Plant and Equipment
Segment Reporting Information [Line Items]
Long-Lived Assets	19,803	18,962
Other Intangible Assets
Segment Reporting Information [Line Items]
Long-Lived Assets	93,556	$ 81,638
Auris Health
Segment Reporting Information [Line Items]
Contingent consideration reversal	(1,148)
bermekimab | In Process Research and Development
Segment Reporting Information [Line Items]
Impairment of intangible assets, excluding goodwill	$ 800
Wholesaler 1 | Sales Revenue, Net | Wholesaler Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk (as a percent)	16.50%	14.00%	16.00%
Wholesaler 2 | Sales Revenue, Net | Wholesaler Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk (as a percent)	13.00%	11.00%	12.00%
Wholesaler 3 | Sales Revenue, Net | Wholesaler Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk (as a percent)	12.00%	11.00%	12.00%
United States
Segment Reporting Information [Line Items]
Sales to Customers	$ 48,580	$ 47,156	$ 43,133
Consumer Health
Segment Reporting Information [Line Items]
Sales to Customers	14,953	15,035	14,450
Litigation expense		1,600	3,900
Charges	100	100
Consumer Health | United States
Segment Reporting Information [Line Items]
Sales to Customers	6,599	6,516	6,362
Pharmaceutical
Segment Reporting Information [Line Items]
Sales to Customers	52,563	51,680	45,175
Litigation expense	100	600	800
Charges		100	100
Gain (loss) on divestiture		600
Marketable securities, realized gain (loss)	(700)	500
Pharmaceutical | United States
Segment Reporting Information [Line Items]
Sales to Customers	28,604	27,954	25,735
Medical Devices
Segment Reporting Information [Line Items]
Sales to Customers	27,427	27,060	22,959
Litigation expense	600	100	300
Charges	300	300	300
In-process research and development		900	200
Regulation charge	300	200	100
Acquisition Costs, Period Cost	300
Medical Devices | Auris Health | Other Income
Segment Reporting Information [Line Items]
Contingent consideration reversal			(1,100)
Medical Devices | United States
Segment Reporting Information [Line Items]
Sales to Customers	13,377	12,686	11,036
Segments Total
Segment Reporting Information [Line Items]
Identifiable Assets	153,460	142,829
Additions to Property, Plant & Equipment	3,817	3,462	3,091
Depreciation and Amortization	6,647	7,074	6,931
Consumer Health Business
Segment Reporting Information [Line Items]
Litigation expense	200
Charges	100
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Less: Expense not allocated to segments	624	1,072	945
Other Non Long Lived Assets	74,019	81,418
Corporate, Non-Segment | Consumer Health Business
Segment Reporting Information [Line Items]
Less: Expense not allocated to segments	1,089	67
Corporate, Non-Segment | General Corporate
Segment Reporting Information [Line Items]
Identifiable Assets	33,918	39,189
Additions to Property, Plant & Equipment	192	190	256
Depreciation and Amortization	323	316	300
Long-Lived Assets	1,134	1,014
Operating Segments
Segment Reporting Information [Line Items]
Earnings before provision for taxes on income	23,438	23,915	17,442
Sales to Customers	94,943	93,775	82,584
Long-Lived Assets	112,225	99,586
Operating Segments | United States
Segment Reporting Information [Line Items]
Sales to Customers	48,580	47,156	43,133
Long-Lived Assets	66,283	48,586
Operating Segments | Europe
Segment Reporting Information [Line Items]
Sales to Customers	23,449	23,594	18,980
Long-Lived Assets	38,774	43,257
Operating Segments | Western Hemisphere excluding U.S.
Segment Reporting Information [Line Items]
Sales to Customers	6,125	5,750	5,335
Long-Lived Assets	2,737	2,708
Operating Segments | Asia-Pacific, Africa
Segment Reporting Information [Line Items]
Sales to Customers	16,789	17,275	15,136
Long-Lived Assets	4,431	5,035
Operating Segments | Consumer Health
Segment Reporting Information [Line Items]
Earnings before provision for taxes on income	2,930	1,573	(852)
Identifiable Assets	24,068	25,081
Additions to Property, Plant & Equipment	323	331	248
Depreciation and Amortization	658	759	785
Operating Segments | Pharmaceutical
Segment Reporting Information [Line Items]
Earnings before provision for taxes on income	15,901	17,969	15,250
Identifiable Assets	58,436	64,376
Additions to Property, Plant & Equipment	1,374	1,198	863
Depreciation and Amortization	3,687	4,029	4,006
Unrealized gain (loss) on securities			500
Supplies Expense	1,500
Operating Segments | Medical Devices
Segment Reporting Information [Line Items]
Earnings before provision for taxes on income	4,607	4,373	3,044
Identifiable Assets	70,956	53,372
Additions to Property, Plant & Equipment	2,120	1,933	1,980
Depreciation and Amortization	2,302	2,286	2,140
Immunology | Pharmaceutical
Segment Reporting Information [Line Items]
Sales to Customers	16,935	16,750	15,055
Immunology | Pharmaceutical | United States
Segment Reporting Information [Line Items]
Sales to Customers	$ 11,036	$ 10,843	$ 10,175

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