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Acquisition and Equity-Method Investment - Equity Method Investment Narrative (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2024
Mar. 31, 2024
Sep. 29, 2024
Oct. 01, 2023
Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]          
Proceeds from partial sale of investment in Haleon [1]     $ 3,491 $ 0  
Haleon [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage     23.00%   32.00%
Equity method investment, ownership percentage sold 30.00%        
Proceeds from partial sale of investment in Haleon   $ 3,500      
Gain on sale of equity method investment   $ 150      
Equity-method investment, quoted market value     $ 11,000    
Haleon [Member] | Sale of Equity-Method Investment in Public Stock Offering [Member]          
Schedule of Equity Method Investments [Line Items]          
Number of shares sold in transaction (in shares) 791        
Haleon [Member] | Sale of Equity-Method Investment in Private Placement [Member]          
Schedule of Equity Method Investments [Line Items]          
Number of shares sold in transaction (in shares) 102        
[1] See Note 2B.