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
Apr. 01, 2012
Mar. 27, 2011
Equity, royalty and interest income from investees    
Cummins share of net income $ 92 $ 87
Royalty and interest income 12 9
Equity, royalty and interest income from investees 104 96
Distribution - North American distributors
    
Equity, royalty and interest income from investees    
Cummins share of net income 40 30
Distribution - Komatsu Cummins Chile, Ltda.
    
Equity, royalty and interest income from investees    
Cummins share of net income 5 4
Distribution - All other distributors
    
Equity, royalty and interest income from investees    
Cummins share of net income 1 1
Manufacturing - Chongqing Cummins Engine Company, Ltd.
    
Equity, royalty and interest income from investees    
Cummins share of net income 18 12
Manufacturing - Dongfeng Cummins Engine Company, Ltd.
    
Equity, royalty and interest income from investees    
Cummins share of net income 16 23
Manufacturing - Cummins Westport, Inc.
    
Equity, royalty and interest income from investees    
Cummins share of net income 5 1
Manufacturing - Tata Cummins, Ltd.
    
Equity, royalty and interest income from investees    
Cummins share of net income 4 4
Manufacturing - Shanghai Fleetguard Filter Co., Ltd.
    
Equity, royalty and interest income from investees    
Cummins share of net income 3 4
Manufacturing - Valvoline Cummins, Ltd.
    
Equity, royalty and interest income from investees    
Cummins share of net income 2 2
Manufacturing - Komatsu manufacturing alliances
    
Equity, royalty and interest income from investees    
Cummins share of net income (1) 2
Manufacturing - Beijing Foton Cummins Engine Co., Ltd.
    
Equity, royalty and interest income from investees    
Cummins share of net income (2) (2)
Manufacturing - All other manufacturers
    
Equity, royalty and interest income from investees    
Cummins share of net income $ 1 $ 6