v3.25.4
Acquisitions, Divestitures, Equity-Method Investments, Collaborative Arrangements, Research and Development Arrangements and In-Licensing Arrangements - Equity Method Investments (Details) - USD ($)
shares in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2024
Mar. 31, 2024
Jun. 29, 2025
Mar. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Jun. 30, 2024
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]                  
Proceeds from partial sales of investment in Haleon [1]         $ 6,311,000,000 $ 7,040,000,000 $ 0    
Equity-method investments         $ 235,000,000 217,000,000      
ViiV [Member]                  
Schedule of Equity Method Investments [Line Items]                  
Equity method investment, ownership percentage         11.70%        
Equity-method investments                 $ 0
Dividend income         $ (265,000,000) $ (272,000,000) $ (265,000,000)    
Haleon [Member]                  
Schedule of Equity Method Investments [Line Items]                  
Equity method investment, ownership percentage 15.00%         32.00% 32.00% 23.00%  
Equity method investment, ownership percentage sold 34.00% 30.00%              
Proceeds from partial sales of investment in Haleon $ 3,500,000,000 $ 3,500,000,000 $ 6,300,000,000            
Gain on sale of equity method investment       $ 144,000,000 $ 945,000,000 $ 945,000,000      
Equity-method investments           $ 0 $ 11,451,000,000    
Haleon [Member] | Sale of Equity-Method Investment in Private Placement                  
Schedule of Equity Method Investments [Line Items]                  
Number of shares sold in transaction (in shares) 61 102              
Haleon [Member] | Sale of Equity-Method Investment in Public Stock Offering                  
Schedule of Equity Method Investments [Line Items]                  
Number of shares sold in transaction (in shares) 640 791              
[1] See Note 2C.