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Segments of Business and Geographic Areas - Schedule of Segment Reporting Information (Details) $ in Millions | 12 Months Ended
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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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