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Contingent Consideration (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
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 219 $ 0  
Contingent consideration net expense (benefit) (6) $ (108)  
Payment of contingent consideration (11)    
Business Combination, Contingent Consideration, Liability Ending Balance 398    
Business Combination, Contingent Consideration Arrangements [Abstract]      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High     $ 754
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]      
Business Combination, Contingent Consideration, Liability 398   398
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 103    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]      
Business Combination, Contingent Consideration, Liability 103   $ 103
contingent consideration liability, probability of payment     90.00%
Discount Rate, Fair Value Input     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 296    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]      
Business Combination, Contingent Consideration, Liability $ 296   $ 296
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%
Discount Rate, Fair Value Input     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%
Discount Rate, Fair Value Input     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     90.00%
Discount Rate, Fair Value Input     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%
Discount Rate, Fair Value Input     7.00%