Quarterly report pursuant to Section 13 or 15(d)

EQUITY, ROYALTY AND INTEREST INCOME FROM INVESTEES (Details)

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EQUITY, ROYALTY AND INTEREST INCOME FROM INVESTEES (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 25, 2011
Sep. 30, 2012
Sep. 25, 2011
Equity, royalty and interest income from investees        
Cummins share of net income $ 85 $ 94 $ 272 $ 284
Royalty and interest income 9 8 30 31
Equity, royalty and interest income from investees 94 102 302 315
Distribution - North American distributors
        
Equity, royalty and interest income from investees        
Cummins share of net income 37 35 115 100
Distribution - Komatsu Cummins Chile, Ltda.
        
Equity, royalty and interest income from investees        
Cummins share of net income 9 6 20 16
Distribution - All other distributors
        
Equity, royalty and interest income from investees        
Cummins share of net income   1 3 3
Manufacturing - Chongqing Cummins Engine Company, Ltd.
        
Equity, royalty and interest income from investees        
Cummins share of net income 14 20 49 51
Manufacturing - Dongfeng Cummins Engine Company, Ltd.
        
Equity, royalty and interest income from investees        
Cummins share of net income 9 15 42 64
Manufacturing - Shanghai Fleetguard Filter Co., Ltd.
        
Equity, royalty and interest income from investees        
Cummins share of net income 3 4 10 12
Manufacturing - Beijing Foton Cummins Engine Co., Ltd.
        
Equity, royalty and interest income from investees        
Cummins share of net income 3 (2) 3 (5)
Manufacturing - Cummins Westport, Inc.
        
Equity, royalty and interest income from investees        
Cummins share of net income 2 4 11 8
Manufacturing - Valvoline Cummins, Ltd.
        
Equity, royalty and interest income from investees        
Cummins share of net income 2 2 6 6
Manufacturing - Tata Cummins, Ltd.
        
Equity, royalty and interest income from investees        
Cummins share of net income   2 7 9
Manufacturing - Komatsu manufacturing alliances
        
Equity, royalty and interest income from investees        
Cummins share of net income (1)   (1) 1
Manufacturing - All other manufacturers
        
Equity, royalty and interest income from investees        
Cummins share of net income $ 7 $ 7 $ 7 $ 19