| 
           Segment Information (Detail) (USD $) 
        In Millions, unless otherwise specified  | 
        3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
| 
           Sep. 30, 2012 
         | 
        
           Sep. 30, 2011 
         | 
        
           Sep. 30, 2012 
         | 
        
           Sep. 30, 2011 
         | 
      |
| Segment Reporting Information [Line Items] | ||||
| Revenue | $ 13,071 | $ 13,166 | $ 39,556 | $ 38,939 | 
| Operating Income (Loss) | 766 | 1,666 | 4,125 | 4,883 | 
| 
           U.S. Domestic Package 
         | 
        ||||
| Segment Reporting Information [Line Items] | ||||
| Revenue | 7,861 | 7,767 | 23,923 | 23,047 | 
| Operating Income (Loss) | 129 | 1,046 | 2,258 | 2,923 | 
| 
           International Package 
         | 
        ||||
| Segment Reporting Information [Line Items] | ||||
| Revenue | 2,943 | 3,057 | 8,923 | 9,096 | 
| Operating Income (Loss) | 449 | 417 | 1,311 | 1,375 | 
| 
           Supply Chain & Freight 
         | 
        ||||
| Segment Reporting Information [Line Items] | ||||
| Revenue | 2,267 | 2,342 | 6,710 | 6,796 | 
| Operating Income (Loss) | $ 188 | $ 203 | $ 556 | $ 585 |