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Other Impairments, Restructuring and Other Items - Additional Information (Detail)
$ in Millions
 3 Months Ended 27 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2018
Position
Restructuring Cost and Reserve [Line Items]      
Restructuring plan period 2 years    
Impairments of long-lived intangible assets $ 206    
Impairments of property, plant and equipment 226    
Restructuring cost 247 $ 130  
Impairments 432 $ 11  
Expected reduction in positions | Position     6,200
INDIA      
Restructuring Cost and Reserve [Line Items]      
Impairments 56    
Facility Exit Costs And Other Related Restructuring [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring cost 147    
Facility Exit Costs And Other Related Restructuring [Member] | ISRAEL      
Restructuring Cost and Reserve [Line Items]      
Restructuring cost 113    
Headquarters and Distribution Sites Consolidation [Member] | United States [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring cost 34    
In Process Research and Development [Member]      
Restructuring Cost and Reserve [Line Items]      
Impairments of long-lived intangible assets 117    
Identifiable product rights [Member]      
Restructuring Cost and Reserve [Line Items]      
Impairments of long-lived intangible assets $ 76