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Acquisitions and Strategic Investments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Business Acquisition [Line Items]      
Goodwill $ 6,477   $ 6,473
Accrued Contingent Consideration 188   $ 246
Adjustments to accrued contingent consideration 1    
Maximum future contingent consideration for acquisitions 1,586    
Payment of contingent consideration (63) $ (99)  
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability 4 $ 27  
Contingent payment related to business combination 63    
revenue-based payments [Member] | Monte Carlo [Member]      
Business Acquisition [Line Items]      
Business Combination, Contingent Consideration, Liability (106)    
revenue-based payments [Member] | Discounted cash flow [Member]      
Business Acquisition [Line Items]      
Business Combination, Contingent Consideration, Liability (62)    
R&D and Commercialization-based Milestone [Member] | Discounted cash flow [Member]      
Business Acquisition [Line Items]      
Business Combination, Contingent Consideration, Liability $ (20)    
Minimum [Member] | revenue-based payments [Member] | Monte Carlo [Member]      
Business Acquisition [Line Items]      
Revenue Volatility - Contingent Consideration 15.00%    
contingent consideration liability, projected year of payment 2016    
Minimum [Member] | revenue-based payments [Member] | Discounted cash flow [Member]      
Business Acquisition [Line Items]      
Fair Value Inputs, Discount Rate 11.00%    
contingent consideration liability, projected year of payment 2016    
Minimum [Member] | R&D and Commercialization-based Milestone [Member] | Discounted cash flow [Member]      
Business Acquisition [Line Items]      
Fair Value Inputs, Discount Rate 2.10%    
contingent consideration liability, probability of payment 32.00%    
contingent consideration liability, projected year of payment 2017    
Maximum [Member] | revenue-based payments [Member] | Monte Carlo [Member]      
Business Acquisition [Line Items]      
contingent consideration liability, projected year of payment 2018    
Maximum [Member] | revenue-based payments [Member] | Discounted cash flow [Member]      
Business Acquisition [Line Items]      
Fair Value Inputs, Discount Rate 15.00%    
contingent consideration liability, projected year of payment 2022    
Maximum [Member] | R&D and Commercialization-based Milestone [Member] | Discounted cash flow [Member]      
Business Acquisition [Line Items]      
Fair Value Inputs, Discount Rate 3.70%    
contingent consideration liability, probability of payment 95.00%    
contingent consideration liability, projected year of payment 2021