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Goodwill and Intangible Assets - Additional Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Intangible Assets [Line Items]        
Accumulated goodwill impairment losses   $ 0    
Discount rate of acquired IPR&D 9.50% 8.00% 9.50%  
In-process research and development impairment $ 800,000,000 $ 0 $ 800,000,000 $ 820,000,000
Cost of goods sold        
Intangible Assets [Line Items]        
Aggregate amortization expense related to finite-lived intangible assets   $ 1,200,000,000 $ 1,100,000,000 1,200,000,000
Kite 585 Program        
Intangible Assets [Line Items]        
Gross  Carrying Amount       $ 0