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Product, Geographic and Other Revenue Information - Revenues By Geographic Area (Detail) - USD ($)
$ in Millions
 3 Months Ended
Apr. 04, 2021
Mar. 29, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues [1] $ 14,582 $ 10,083
Percentage Change In Revenue 45.00%  
U.S. [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues $ 7,597 5,289
Percentage Change In Revenue 44.00%  
Developed Europe [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues $ 3,038 1,708
Percentage Change In Revenue 78.00%  
Developed Rest Of World [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues $ 1,123 919
Percentage Change In Revenue 22.00%  
Emerging Markets [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues $ 2,824 $ 2,166
Percentage Change In Revenue 30.00%  
[1] On November 16, 2020, we completed the spin-off and the combination of our Upjohn Business with Mylan to form Viatris. See Note 1A. Beginning in the fourth quarter of 2020, the results of our Meridian subsidiary, which was previously included in our former Upjohn operating segment, are reported in the Hospital therapeutic area for all periods presented.