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Summary of Accounting Policies (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Summary Of Significant Accounting Policies [Line Items]        
Product return period and expiration 12 months      
Customer discounts $ 11,800 $ 10,700 $ 10,700  
Accrual for chargebacks reflected as direct reduction to accounts receivable 233 245    
Accrual for rebates included in accrued and other current liabilities 2,200 2,400    
Depreciation 1,700 1,400 1,500  
Advertising and promotion costs 2,100 2,100 2,200  
Decrease in deferred income taxes (1,470) (1,702)    
Accumulated other comprehensive loss 6,193 5,545    
Net periodic defined benefit plan (credit) cost other than service cost (545) (512) $ (512)  
Operating lease, right-of-use assets 1,073      
Operating lease, liability 1,004      
Accounting Standards Update 2016-02        
Summary Of Significant Accounting Policies [Line Items]        
Operating lease, right-of-use assets       $ 1,100
Operating lease, liability       $ 1,100
Enterprise wide resource planning system        
Summary Of Significant Accounting Policies [Line Items]        
Unamortized capitalized software costs $ 548 $ 439    
Minimum        
Summary Of Significant Accounting Policies [Line Items]        
Product return period 3 months      
Estimated useful life of intangible assets 2 years      
Minimum | Enterprise wide resource planning system        
Summary Of Significant Accounting Policies [Line Items]        
Estimated useful life of intangible assets 6 years      
Minimum | Capitalized Software        
Summary Of Significant Accounting Policies [Line Items]        
Estimated useful life of intangible assets 3 years      
Minimum | Buildings        
Summary Of Significant Accounting Policies [Line Items]        
Estimated useful life of property, plant and equipment 25 years      
Minimum | Machinery, equipment and office furnishings        
Summary Of Significant Accounting Policies [Line Items]        
Estimated useful life of property, plant and equipment 3 years      
Minimum | United States | Pharmaceutical segment        
Summary Of Significant Accounting Policies [Line Items]        
Payment terms 36 days      
Minimum | United States | Animal Health        
Summary Of Significant Accounting Policies [Line Items]        
Payment terms 30 days      
Minimum | Outside of the United States        
Summary Of Significant Accounting Policies [Line Items]        
Payment terms 30 days      
Maximum        
Summary Of Significant Accounting Policies [Line Items]        
Product return period 6 months      
Estimated useful life of intangible assets 24 years      
Maximum | Enterprise wide resource planning system        
Summary Of Significant Accounting Policies [Line Items]        
Estimated useful life of intangible assets 10 years      
Maximum | Capitalized Software        
Summary Of Significant Accounting Policies [Line Items]        
Estimated useful life of intangible assets 5 years      
Maximum | Buildings        
Summary Of Significant Accounting Policies [Line Items]        
Estimated useful life of property, plant and equipment 45 years      
Maximum | Machinery, equipment and office furnishings        
Summary Of Significant Accounting Policies [Line Items]        
Estimated useful life of property, plant and equipment 15 years      
Maximum | Outside of the United States        
Summary Of Significant Accounting Policies [Line Items]        
Payment terms 90 days      
Keytruda | Maximum | United States        
Summary Of Significant Accounting Policies [Line Items]        
Payment terms 90 days