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Contingent Consideration (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases $ 0 $ 127 $ 248
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred   (16)  
Payment of contingent consideration 58 68  
Contingent consideration net expense (benefit) (100) (35) (21)
Business Combination, Contingent Consideration Arrangements [Abstract]      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 532    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]      
Business Combination, Contingent Consideration, Liability $ 196 $ 354 $ 347
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%    
Business Combination, Contingent Consideration, Liability $ 104    
Valuation Technique, Discounted Cash Flow [Member] | revenue-based payments [Member]      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]      
Business Combination, Contingent Consideration, Liability $ 93    
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 12.00%    
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 13.00%