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Acquisitions, Divestitures, Equity-Method Investments and Assets and Liabilities Held for Sale, Licensing Arrangements and Research and Development and Collaborative Arrangements - Array BioPharma Inc (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jul. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Cash payments for acquisition, net of cash acquired   $ 10,861 $ 0 $ 1,000
Goodwill   58,653 $ 53,411 $ 55,952
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 7,200      
Goodwill 5,400      
Net deferred tax liabilities 1,300      
Assumed long-term debt $ 451      
Array [Member] | Restructuring Charges And Acquisition-Related Costs [Member]        
Business Acquisition [Line Items]        
Post closing compensation expense for payments to Array employees for fair value of previously unvested stock options   $ 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]        
Acquired intangible assets, useful life 16 years      
Identifiable intangible assets $ 1,800      
In Process Research and Development [Member] | Array [Member]        
Business Acquisition [Line Items]        
Identifiable intangible assets 4,000      
Licensing Agreements [Member] | Array [Member]        
Business Acquisition [Line Items]        
Intangible assets 1,400      
Licensing Agreements, Technology In Development [Member] | Array [Member]        
Business Acquisition [Line Items]        
Intangible assets 1,100      
Licensing Agreements, Developed Technology [Member] | Array [Member]        
Business Acquisition [Line Items]        
Identifiable intangible assets $ 340      
Finite-lived intangible asset, useful life 10 years