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Summary of Significant Accounting Policies - Narrative (Details)
$ in Millions
 12 Months Ended
Jan. 01, 2023
USD ($)
Segment
Employee
Jan. 02, 2022
USD ($)
Jan. 03, 2021
USD ($)
Dec. 30, 2018
Dec. 31, 2017
Concentration of Credit Risk [Line Items]          
Number of employees | Employee 152,700        
Number of business segments | Segment 3        
Minimum reverse repurchase agreement collateral (as a percent) 102.00%        
Accrued Rebates Returns And Promotions $ 14,417 $ 12,095      
Sales return reserve (as a percent) 1.00% 1.00% 1.00%    
Percentage of profit share payments (less than) 2.00% 3.00% 3.00%    
Cost of products sold $ 31,089 $ 29,855 $ 28,427    
Shipping and handling costs as a percent of sales 1.00% 1.00% 1.00%    
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other assets, noncurrent Other assets, noncurrent      
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Accrued Liabilities, Current Accrued Liabilities, Current      
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Noncurrent Other Liabilities, Noncurrent      
Operating lease, right-of-use asset $ 1,100 $ 900      
Operating lease liabilities 1,300 1,000      
Operating lease costs 300 300 $ 300    
Cash paid for operating leases 300 300 300    
Advertising expense $ 2,100 $ 2,700 $ 2,100    
U.S. statutory rate 21.00% 21.00% 21.00% 21.00% 35.00%
TCJA, undistributed foreign earnings percent related to cash and cash equivalents       15.50%  
TCJA, undistributed foreign earnings percent related to earnings other than cash and cash equivalents       8.00%  
TCJA, provisional liability $ 6,100        
TJCA , provisional liability, non-current 4,600        
Repatriation of foreign earnings amount $ 500        
Minimum | Software Development          
Concentration of Credit Risk [Line Items]          
Estimated useful lives of the assets 3 years        
Maximum | Software Development          
Concentration of Credit Risk [Line Items]          
Estimated useful lives of the assets 8 years        
R&D Expense | Project Concentration Risk          
Concentration of Credit Risk [Line Items]          
Concentration risk, threshold percentage (as a percent) 0.05 0.05 0.05    
Shipping and Handling          
Concentration of Credit Risk [Line Items]          
Cost of products sold $ 1,100 $ 1,100 $ 1,000    
Pharmaceutical          
Concentration of Credit Risk [Line Items]          
Accrued Rebates Returns And Promotions $ 9,600 $ 7,700