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Acquisition, Collaborations and Other Arrangements - Acquisition (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Oct. 03, 2017
Sep. 30, 2018
Business Acquisition [Line Items]    
Total consideration transferred $ 11,155  
Replaced stock-based compensation attributable to the pre-combination period 75  
Payments to Outstanding Common Stockholders    
Business Acquisition [Line Items]    
Cash consideration 10,420  
Payments to Vested Equity Award Holders    
Business Acquisition [Line Items]    
Cash consideration 645  
Payments to Warrant Holders    
Business Acquisition [Line Items]    
Cash consideration $ 15  
Kite Pharma, Inc    
Business Acquisition [Line Items]    
Share price (in dollars per share) $ 180  
Reduction to goodwill   $ 42
Kite Pharma, Inc | Share Based Compensation Expense    
Business Acquisition [Line Items]    
Replaced stock-based compensation attributable to the post-combination period $ 733