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Contingent Consideration (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]      
Business Combination, Contingent Consideration, Liability Beginning Balance $ 347    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases 87    
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability (28) $ 5  
Payment of contingent consideration (11)    
Business Combination, Contingent Consideration, Liability Ending Balance 394    
Business Combination, Contingent Consideration Arrangements [Abstract]      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High     $ 914
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]      
Business Combination, Contingent Consideration, Liability 347   394
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 276    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]      
Business Combination, Contingent Consideration, Liability 276   276
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 119    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]      
Business Combination, Contingent Consideration, Liability $ 119   $ 119
Minimum [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, projected year of payment 2019    
contingent consideration liability, probability of payment     17.00%
Discount Rate, Fair Value Input 3.00%    
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, projected year of payment 2019    
contingent consideration liability, probability of payment     60.00%
Discount Rate, Fair Value Input 10.50%    
Maximum [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, projected year of payment 2027    
contingent consideration liability, probability of payment     99.00%
Discount Rate, Fair Value Input 4.30%    
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, projected year of payment 2026    
contingent consideration liability, probability of payment     100.00%
Discount Rate, Fair Value Input 15.00%