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Contingencies and Certain Commitments (Commitments and Contingent Consideration for Acquisitions) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]      
Long-term purchase commitment, amount   $ 2,500  
Repatriation tax liability   15,000  
Payment for repatriation tax $ 750    
Fair value of contingent consideration   711 $ 988
Contingent consideration liability, current   160 280
Contingent consideration liability, noncurrent   $ 551 $ 708
Besponsa [Member]      
Loss Contingencies [Line Items]      
Research and development arrangement, aggregate payment obligation, term   7 years  
Research arrangement, fixed payment obligation   $ 412  
Bosulif [Member]      
Loss Contingencies [Line Items]      
Research and development arrangement, aggregate payment obligation, term   8 years  
Research arrangement, fixed payment obligation   $ 217  
Income Taxes Payable [Member]      
Loss Contingencies [Line Items]      
Repatriation tax liability   $ 600