| 
           COMMITMENTS AND CONTINGENCIES (Details) (USD $) 
        In Millions, unless otherwise specified  | 
        3 Months Ended | 3 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|
| 
           Mar. 31, 2013
 
          U.S. Distributor Commitments 
         | 
        
           Mar. 31, 2013
 
          Other Guarantees and Commitments 
         | 
        
           Mar. 31, 2013
 
          Cummins Olayan Energy Limited debt guarantee 
         | 
        
           Mar. 31, 2013
 
          Residual value guarantees 
         | 
        
           Mar. 31, 2013
 
          Other debt guarantees 
         | 
        
           Mar. 31, 2013
 
          Engine parts supplier 
         | 
        
           Mar. 31, 2013
 
          Performance bonds and other performance-related guarantees 
         | 
        
           Dec. 31, 2012
 
          Performance bonds and other performance-related guarantees 
         | 
        
           Mar. 31, 2013
 
          Joint Venture Commitments 
         | 
      |
| Commitments and contingencies: | |||||||||
| Licensing agreement term | 3 years | ||||||||
| Number of days in which distributors can terminate agreements without cause | 60 days | ||||||||
| Number of days in which distributors can terminate agreements with cause | 30 days | ||||||||
| Guarantee obligations, maximum potential loss | $ 14 | $ 8 | $ 1 | $ 5 | |||||
| Long-term purchase commitment, penalty exposure | 114 | 83 | |||||||
| Annual commitment under purchase contract with emission solutions business supplier through 2018 | 73 | ||||||||
| Guarantee obligations, current carrying value | 69 | 70 | |||||||
| Guarantee obligations commitment | 56 | ||||||||
| Joint venture estimated commitment to be funded this year | $ 13 | ||||||||