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Summary of Accounting Policies - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2019
Jan. 01, 2018
Summary Of Significant Accounting Policies [Line Items]          
Product return period and expiration 12 months        
Customer discounts $ 10,700 $ 10,700 $ 9,700    
Accrual for chargebacks reflected as direct reduction to accounts receivable 245 198      
Accrual for rebates included in accrued and other current liabilities 2,400 2,400      
Depreciation 1,400 1,500 1,600    
Advertising and promotion costs 2,100 2,200 2,100    
Decrease in deferred income taxes (1,702) (2,219)      
Accumulated other comprehensive loss 5,545 4,910      
Net periodic defined benefit plan (credit) cost other than service cost (512) (512) $ (531)    
ASU 2016-01 (Financial Instruments)          
Summary Of Significant Accounting Policies [Line Items]          
Increase (decrease) in retained earnings 8        
Accumulated other comprehensive loss         $ 8
ASU 2016-16 (Intra-Entity Transfers Other than Inventory)          
Summary Of Significant Accounting Policies [Line Items]          
Increase (decrease) in retained earnings 54        
Decrease in deferred income taxes 54       54
Accounting Standards Update 2017-12          
Summary Of Significant Accounting Policies [Line Items]          
Increase (decrease) in retained earnings (11)        
Accounting Standard Update 2018-02          
Summary Of Significant Accounting Policies [Line Items]          
Accumulated other comprehensive loss         $ 266
Enterprise wide resource planning system          
Summary Of Significant Accounting Policies [Line Items]          
Unamortized capitalized software costs 439 $ 449      
Difference between Revenue Guidance in Effect before and after Topic 606 | ASU 2014-09 (Revenue)          
Summary Of Significant Accounting Policies [Line Items]          
Increase (decrease) in retained earnings $ 5        
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 20 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 | United States | Animal Health          
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        
Subsequent Event | Accounting Standards Update 2016-02          
Summary Of Significant Accounting Policies [Line Items]          
Operating lease, right-of-use assets       $ 1,000  
Operating lease, liability       $ 1,000