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Joint Ventures and Other Equity Method Affiliates Joint Ventures and Other Equity Method Affiliates - Termination of SPMSD (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2015
Business Acquisition [Line Items]      
Goodwill $ 18,162 $ 18,284 $ 17,723
Investments in affiliates accounted for using the equity method $ (715) $ (767)  
Step Acquisition and Termination of SPMSD      
Business Acquisition [Line Items]      
Estimated useful life of intangible assets 8 years    
Products and product rights $ 936    
Accounts receivable 133    
Current liabilities (221)    
Deferred income tax liabilities (147)    
Other current assets 47    
Total identifiable net assets 748    
Consideration payable to Sanofi, net (392)    
Investments in affiliates accounted for using the equity method (183)    
Increase in net assets 173    
Merck's share of restructuring costs (77)    
Net loss on termination of SPMSD joint venture $ 96