|**Other Financial Information (Tables)**               | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|------------------------------------------------------ | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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|**Other Financial Information [Abstract]**             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Schedule of Components of Inventories, Current         | The following summarizes the components ofInventories:(MILLIONS)July 3,2022December 31, 2021Finished goods$3,219$3,641Work-in-process5,1944,424Raw materials and supplies2,041994Inventories(a)$10,454$9,059Noncurrent inventories not included above(b)$943$939(a)The increase from December 31, 2021 primarily reflects higher inventory levels for Paxlovid, and increases for certain products due to network strategy and supply recovery, partially offset by decreases due to market demand.(b)Included inOther noncurrent assets.
|                                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|The following summarizes the components ofInventories:
|(MILLIONS)                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Finished goods                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Work-in-process                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Raw materials and supplies                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Inventories(a)                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Noncurrent inventories not included above(b)           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Schedule of Components of Inventories, Noncurrent      | The following summarizes the components ofInventories:(MILLIONS)July 3,2022December 31, 2021Finished goods$3,219$3,641Work-in-process5,1944,424Raw materials and supplies2,041994Inventories(a)$10,454$9,059Noncurrent inventories not included above(b)$943$939(a)The increase from December 31, 2021 primarily reflects higher inventory levels for Paxlovid, and increases for certain products due to network strategy and supply recovery, partially offset by decreases due to market demand.(b)Included inOther noncurrent assets.
|                                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|The following summarizes the components ofInventories:
|(MILLIONS)                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Finished goods                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Work-in-process                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Raw materials and supplies                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Inventories(a)                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Noncurrent inventories not included above(b)           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          

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