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Summary of Accounting Policies (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items]      
Product return period and expiration 12 months    
Customer discounts $ 13,100 $ 11,800 $ 10,700
Accrual for chargebacks reflected as direct reduction to accounts receivable 249 233  
Accrual for rebates included in accrued and other current liabilities 2,900 2,200  
Depreciation 1,726 1,679 1,416
Advertising and promotion costs 2,000 2,100 2,100
Decrease in deferred income taxes (1,015) (1,470)  
Accumulated other comprehensive loss 6,634 6,193  
Net periodic defined benefit plan (credit) cost other than service cost $ (339) $ (545) $ (512)
Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Product return period 3 months    
Estimated useful life of intangible assets 2 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 | Capitalized Software      
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful life of intangible assets 10 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 | United States      
Summary Of Significant Accounting Policies [Line Items]      
Payment terms 90 days    
Maximum | Outside of the United States      
Summary Of Significant Accounting Policies [Line Items]      
Payment terms 90 days