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Acquisitions, Divestitures, Equity-Method Investments, Licensing Arrangements and Collaborative Arrangements - Acquisitions (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jul. 30, 2019
Jul. 01, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]          
Cash payments for acquisition, net of cash acquired     $ 0 $ 10,861 $ 0
Goodwill     49,577 48,202 $ 42,927
Therachon Asset Acquisition [Member]          
Business Acquisition [Line Items]          
Upfront payment   $ 340      
Maximum potential milestone payments   470      
Percentage of shares acquired         3.00%
Payments to acquire asset   317     $ 5
Fair value of consideration transferred   322      
Charge to research and development expenses in connection with asset acquisition   $ 337      
Array [Member]          
Business Acquisition [Line Items]          
Business acquisition, per share in cash (in dollars per share) $ 48        
Payments to acquire businesses, cash portion $ 11,200        
Cash payments for acquisition, net of cash acquired 10,900        
Intangible assets 6,300        
Goodwill 6,100        
Net deferred tax liabilities 1,100        
Assumed long-term debt 451        
Reduction in intangible assets due to measurement period adjustments     $ 900    
Array [Member] | Restructuring Charges And Acquisition-Related Costs [Member]          
Business Acquisition [Line Items]          
Post closing compensation expense       $ 157  
Developed Technology Rights [Member]          
Business Acquisition [Line Items]          
Finite-lived intangible asset, useful life     9 years    
Developed Technology Rights [Member] | Array [Member]          
Business Acquisition [Line Items]          
Identifiable intangible assets $ 2,000        
Acquired intangible assets, useful life 16 years        
Reduction in intangible assets due to measurement period adjustments     $ (200)    
IPR&D [Member] | Array [Member]          
Business Acquisition [Line Items]          
Identifiable intangible assets $ 2,800        
Reduction in intangible assets due to measurement period adjustments     $ 1,200    
Licensing Agreements [Member] | Array [Member]          
Business Acquisition [Line Items]          
Intangible assets 1,500        
Licensing Agreements, Technology In Development [Member] | Array [Member]          
Business Acquisition [Line Items]          
Intangible assets 1,200        
Licensing Agreements, Developed Technology [Member] | Array [Member]          
Business Acquisition [Line Items]          
Identifiable intangible assets $ 360        
Finite-lived intangible asset, useful life 10 years