Annual report pursuant to Section 13 and 15(d)

INVESTMENTS IN EQUITY INVESTEES (Details)

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INVESTMENTS IN EQUITY INVESTEES (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Equity, royalty and interest income from investees:      
Investments and advances to equity investees $ 897 $ 838 $ 734
Cummins share of net income 347 375 321
Royalty and interest income 37 41 30
Equity, royalty and interest income from investees 384 416 351
Deconsolidation of variable interest entity
     
Equity, royalty and interest income from investees:      
Decrease in current assets     9
Decrease in long-term assets     10
Increase in investments and advances related to equity method investees     11
Decrease in noncontrolling interest     11
Minimum
     
Equity, royalty and interest income from investees:      
Ownership percentage 20.00%    
Maximum
     
Equity, royalty and interest income from investees:      
Ownership percentage 50.00%    
Distribution - North American distributors
     
Equity, royalty and interest income from investees:      
Investments and advances to equity investees 139 127  
Cummins share of net income 147 134 101
Number of partially-owned distributors 11    
Minimum ownership percentage in partially-owned distributors that are consolidated 50.00%    
Number of partially-owned distributors, consolidated 4    
Distribution - North American distributors | Minimum
     
Equity, royalty and interest income from investees:      
Ownership percentage 30.00%    
Distribution - North American distributors | Maximum
     
Equity, royalty and interest income from investees:      
Ownership percentage 50.00%    
Distribution - International distributors
     
Equity, royalty and interest income from investees:      
Ownership percentage 50.00%    
Number of partially-owned distributors 6    
Distribution - Komatsu Cummins Chile, Ltda.
     
Equity, royalty and interest income from investees:      
Cummins share of net income 26 22 16
Distribution - All other distributors
     
Equity, royalty and interest income from investees:      
Cummins share of net income 4 4 3
Komatsu alliances
     
Equity, royalty and interest income from investees:      
Investments and advances to equity investees 132 115  
Komatsu alliances | Minimum
     
Equity, royalty and interest income from investees:      
Ownership percentage 20.00%    
Komatsu alliances | Maximum
     
Equity, royalty and interest income from investees:      
Ownership percentage 50.00%    
Manufacturing Entities | Minimum
     
Equity, royalty and interest income from investees:      
Ownership percentage of joint venture included in Consolidated Financial Statements 50.00%    
Manufacturing - Dongfeng Cummins Engine Company, Ltd.
     
Equity, royalty and interest income from investees:      
Ownership percentage 50.00%    
Investments and advances to equity investees 113 131  
Cummins share of net income 52 80 99
Manufacturing - Dongfeng Cummins Engine Company, Ltd. | Minimum
     
Other disclosure      
Capacity of mechanical engines (in liters) 4    
Power of mechanical engines (in horsepower) 125    
Manufacturing - Dongfeng Cummins Engine Company, Ltd. | Maximum
     
Other disclosure      
Capacity of mechanical engines (in liters) 13    
Power of mechanical engines (in horsepower) 545    
Manufacturing - Chongqing Cummins Engine Company, Ltd.
     
Equity, royalty and interest income from investees:      
Ownership percentage 50.00%    
Investments and advances to equity investees 58 71  
Cummins share of net income 61 68 46
Manufacturing - Shanghai Fleetguard Filter Co., Ltd.
     
Equity, royalty and interest income from investees:      
Ownership percentage 50.00%    
Investments and advances to equity investees 31 29  
Cummins share of net income 13 15 12
Manufacturing - Tata Cummins, Ltd.
     
Equity, royalty and interest income from investees:      
Ownership percentage 50.00%    
Investments and advances to equity investees 52 49  
Cummins share of net income 11 14 14
Manufacturing - Cummins Westport, Inc.
     
Equity, royalty and interest income from investees:      
Cummins share of net income 14 14 10
Manufacturing - Valvoline Cummins, Ltd.
     
Equity, royalty and interest income from investees:      
Ownership percentage 50.00%    
Investments and advances to equity investees 25 20  
Cummins share of net income 8 7 8
Manufacturing - Komatsu manufacturing alliances
     
Equity, royalty and interest income from investees:      
Cummins share of net income (3) 3 11
Number of manufacturing joint ventures 2    
Number of design joint ventures 1    
Manufacturing - Cummins MerCruiser Diesel Marine, LLC
     
Equity, royalty and interest income from investees:      
Number of companies transitioning to a strategic supply arrangement 2    
Manufacturing - Beijing Foton Cummins Engine Co., Ltd.
     
Equity, royalty and interest income from investees:      
Ownership percentage 50.00%    
Investments and advances to equity investees 91 87  
Cummins share of net income 5 (7) (16)
Manufacturing - Beijing Foton Cummins Engine Co., Ltd. | Minimum
     
Other disclosure      
Capacity of mechanical engines (in liters) 2.8    
Manufacturing - Beijing Foton Cummins Engine Co., Ltd. | Maximum
     
Other disclosure      
Capacity of mechanical engines (in liters) 3.8    
Manufacturing - Cummins-Scania XPI Manufacturing, LLC
     
Equity, royalty and interest income from investees:      
Ownership percentage 50.00%    
Investments and advances to equity investees 65 62  
Manufacturing - Cummins Olayan Energy Limited Guarantee
     
Equity, royalty and interest income from investees:      
Ownership percentage 49.00%    
Investments and advances to equity investees 34 30  
Manufacturing - Guangxi Cummins Industrial Power Co., Ltd.
     
Equity, royalty and interest income from investees:      
Ownership percentage 50.00%    
Investments and advances to equity investees 30    
Manufacturing - Guangxi Cummins Industrial Power Co., Ltd. | Minimum
     
Other disclosure      
Capacity of mechanical engines (in liters) 6.7    
Manufacturing - Guangxi Cummins Industrial Power Co., Ltd. | Maximum
     
Other disclosure      
Capacity of mechanical engines (in liters) 9.3    
Manufacturing - Fleetguard Filters Private, Ltd.
     
Equity, royalty and interest income from investees:      
Ownership percentage 50.00%    
Investments and advances to equity investees 23 22  
Manufacturing - All other manufacturers
     
Equity, royalty and interest income from investees:      
Cummins share of net income 9 21 17
Other Distributors and Manufacturers
     
Equity, royalty and interest income from investees:      
Investments and advances to equity investees $ 104 $ 95