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 6 Months Ended
Jul. 01, 2012
Jun. 26, 2011
Jul. 01, 2012
Jun. 26, 2011
Equity, royalty and interest income from investees        
Cummins share of net income $ 95 $ 103 $ 187 $ 190
Royalty and interest income 9 14 21 23
Equity, royalty and interest income from investees 104 117 208 213
Distribution - North American distributors
        
Equity, royalty and interest income from investees        
Cummins share of net income 38 35 78 65
Distribution - Komatsu Cummins Chile, Ltda.
        
Equity, royalty and interest income from investees        
Cummins share of net income 6 6 11 10
Distribution - All other distributors
        
Equity, royalty and interest income from investees        
Cummins share of net income 2 1 3 2
Manufacturing - Chongqing Cummins Engine Company, Ltd.
        
Equity, royalty and interest income from investees        
Cummins share of net income 17 19 35 31
Manufacturing - Dongfeng Cummins Engine Company, Ltd.
        
Equity, royalty and interest income from investees        
Cummins share of net income 17 26 33 49
Manufacturing - Cummins Westport, Inc.
        
Equity, royalty and interest income from investees        
Cummins share of net income 4 3 9 4
Manufacturing - Shanghai Fleetguard Filter Co., Ltd.
        
Equity, royalty and interest income from investees        
Cummins share of net income 4 4 7 8
Manufacturing - Tata Cummins, Ltd.
        
Equity, royalty and interest income from investees        
Cummins share of net income 3 3 7 7
Manufacturing - Beijing Foton Cummins Engine Co., Ltd.
        
Equity, royalty and interest income from investees        
Cummins share of net income 2 (1)   (3)
Manufacturing - Valvoline Cummins, Ltd.
        
Equity, royalty and interest income from investees        
Cummins share of net income 2 2 4 4
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 $ (1) $ 6   $ 12