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Goodwill and Other Intangible Assets (Rollforward of Goodwill) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 29, 2023
Sep. 30, 2022
Dec. 31, 2023
Goodwill [Roll Forward]        
Balance at beginning of year $ 35,850 $ 37,276 $ 38,682 $ 37,276
Reallocation among new reporting units 0      
Attributable to acquisitions 232   157 3,851
Adjustments due to finalization of purchase price allocations (2)   17 7
Foreign currency translation and other 1,196   (3,006) 474
Balance at end of year 37,276   35,850 41,608
Goodwill transfers, acquisitions prior to segment reallocation   116    
Operating segments | Biotechnology        
Goodwill [Roll Forward]        
Balance at beginning of year 0 22,087 0 22,087
Reallocation among new reporting units 21,019      
Attributable to acquisitions 176   0 0
Adjustments due to finalization of purchase price allocations 0   0 2
Foreign currency translation and other 892   0 388
Balance at end of year 22,087   0 22,477
Operating segments | Life Sciences        
Goodwill [Roll Forward]        
Balance at beginning of year 29,145 8,314 31,638 8,314
Reallocation among new reporting units (21,019)      
Attributable to acquisitions 43   157 3,851
Adjustments due to finalization of purchase price allocations (2)   26 5
Foreign currency translation and other 147   (2,676) 51
Balance at end of year 8,314   29,145 12,221
Operating segments | Diagnostics        
Goodwill [Roll Forward]        
Balance at beginning of year 6,705 $ 6,875 7,044 6,875
Reallocation among new reporting units 0      
Attributable to acquisitions 13   0 0
Adjustments due to finalization of purchase price allocations 0   (9) 0
Foreign currency translation and other 157   (330) 35
Balance at end of year $ 6,875   $ 6,705 $ 6,910