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Contingent Consideration (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]        
Business Combination, Contingent Consideration, Liability Beginning Balance     $ 196  
Fair value of contingent consideration recorded in purchase accounting     221 $ 0
Contingent consideration net expense (benefit) $ (85) $ 0 (91) $ (108)
Payment of contingent consideration     (14)  
Business Combination, Contingent Consideration, Liability Ending Balance 312   312  
Business Combination, Contingent Consideration Arrangements [Abstract]        
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 751   751  
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]        
Business Combination, Contingent Consideration, Liability 312   312  
Valuation Technique, Discounted Cash Flow [Member] | R&D, Regulatory and Commercialization-based Milestone [Member]        
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]        
Business Combination, Contingent Consideration, Liability Ending Balance 22   22  
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]        
Business Combination, Contingent Consideration, Liability $ 22   $ 22  
contingent consideration liability, probability of payment 20.00%   20.00%  
Discount Rate, Fair Value Input 2.00%   2.00%  
Valuation Technique, Discounted Cash Flow [Member] | revenue-based payments [Member]        
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]        
Business Combination, Contingent Consideration, Liability Ending Balance $ 290   $ 290  
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]        
Business Combination, Contingent Consideration, Liability $ 290   $ 290  
Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] | revenue-based payments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]        
contingent consideration liability, probability of payment 80.00%   80.00%  
Discount Rate, Fair Value Input 4.00%   4.00%  
Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] | revenue-based payments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]        
contingent consideration liability, probability of payment 100.00%   100.00%  
Discount Rate, Fair Value Input 14.00%   14.00%  
Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] | R&D, Regulatory and Commercialization-based Milestone [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]        
contingent consideration liability, probability of payment 20.00%   20.00%  
Discount Rate, Fair Value Input 2.00%   2.00%  
Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] | revenue-based payments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]        
contingent consideration liability, probability of payment 100.00%   100.00%  
Discount Rate, Fair Value Input 6.00%   6.00%