v3.8.0.1
Document and Entity Information - shares
3 Months Ended
Mar. 31, 2018
Apr. 24, 2018
Entity Registrant Name UNITED PARCEL SERVICE INC  
Trading Symbol UPS  
Entity Central Index Key 0001090727  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Document Type 10-Q  
Document Period End Date Mar. 31, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Class A common stock    
Entity Common Stock, Shares Outstanding   172,128,615
Class B common stock    
Entity Common Stock, Shares Outstanding   689,559,566