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Acquisitions and Strategic Investments (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 30, 2018
Apr. 16, 2018
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Business Acquisition [Line Items]          
Adjustments to accrued contingent consideration     $ (22)    
Contingent consideration expense (benefit)     5 $ (50)  
Other Nonoperating Income (Expense)     (23) (2)  
Goodwill     6,984   $ 6,998
Business Combination, Contingent Consideration, Asset     152   $ 169
Payments for acquisitions of businesses, net of cash acquired     9 0  
Payment of contingent consideration       $ (28)  
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High     1,320    
revenue-based payments [Member] | Discounted cash flow [Member]          
Business Acquisition [Line Items]          
Business Combination, Contingent Consideration, Liability     48    
R&D and Commercialization-based Milestone [Member] | Discounted cash flow [Member]          
Business Acquisition [Line Items]          
Business Combination, Contingent Consideration, Liability     $ 105    
Fair Value Inputs, Discount Rate     3.00%    
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     2018    
Minimum [Member] | R&D and Commercialization-based Milestone [Member] | Discounted cash flow [Member]          
Business Acquisition [Line Items]          
contingent consideration liability, probability of payment     17.00%    
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     2026    
Maximum [Member] | R&D and Commercialization-based Milestone [Member] | Discounted cash flow [Member]          
Business Acquisition [Line Items]          
contingent consideration liability, probability of payment     100.00%    
contingent consideration liability, projected year of payment     2022    
Subsequent Event [Member] | NxThera [Member]          
Business Acquisition [Line Items]          
Payments for acquisitions of businesses, net of cash acquired $ 240        
Potential payments based on acheiving certain milestones 85        
Payments to Acquire Businesses, Gross 306        
Potential payments based on certain milestones, gross $ 100        
Subsequent Event [Member] | nVision [Member]          
Business Acquisition [Line Items]          
Payments for acquisitions of businesses, net of cash acquired   $ 150      
Potential payments based on acheiving certain milestones   $ 125