Annual report pursuant to Section 13 and 15(d)

OTHER COMPREHENSIVE INCOME (LOSS) (Details)

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OTHER COMPREHENSIVE INCOME (LOSS) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Other Comprehensive Income (Loss), Before Tax      
Change in pensions and other postretirement defined benefit plans, before tax $ (107) $ 207 $ 14
Foreign currency translation adjustments, before tax amount (120) 52 95
Unrealized gain (loss) on marketable securities:      
Holding gain (loss), before tax (3) 2 2
Reclassification of realized gain (loss) to net income, before tax 3   (2)
Net unrealized gain (loss), before tax   2  
Unrealized gain (loss) on derivatives:      
Holding gain (loss), before tax (26) 8 81
Reclassification of realized gain (loss) to net income, before tax (22) (2) 25
Net unrealized gain (loss), before tax (48) 6 106
Other comprehensive income (loss) attributable to Cummins Inc., before tax (275) 267 215
Noncontrolling Interests, before tax (38) 12 14
Total other comprehensive income (loss), before tax (313) 279 229
Other Comprehensive Income (Loss), Tax (Provision) Benefit      
Change in pensions and other postretirement defined benefit plans, tax (provision) benefit 29 (65) (4)
Foreign currency translation adjustments, tax (provision) benefit 12 (25) (9)
Unrealized gain (loss) on marketable securities:      
Holding gain (loss), tax (provision) benefit 1   (1)
Reclassification of realized gain (loss) to net income, tax (provision) benefit (1)   1
Unrealized gain (loss) on derivatives:      
Holding gain (loss), tax (provision) benefit 11 (3) (25)
Reclassification of realized gain (loss) to net income, tax (provision) benefit 5 1 (6)
Net unrealized gain (loss), tax (provision) benefit 16 (2) (31)
Other comprehensive income (loss) attributable to Cummins Inc., tax (provision) benefit 57 (92) (44)
Total other comprehensive income (loss), tax (provision) benefit 57 (92) (44)
Other comprehensive income (loss), net of tax      
Change in pensions and other postretirement defined benefit plans, net of tax (78) 142 10
Foreign currency translation adjustments (108) 27 86
Unrealized gain (loss) on marketable securities:      
Holding gain (loss), net of tax (2) 2 1
Reclassification of realized gain (loss) to net income, net of tax 2   (1)
Net unrealized gain (loss), net of tax   2  
Unrealized gain (loss) on derivatives:      
Holding gain (loss), net of tax (15) 5 56
Reclassification of realized gain (loss) to net income, net of tax (17) (1) 19
Net unrealized gain (loss), net of tax (32) 4 75
Other comprehensive income (loss) attributable to Cummins Inc., net of tax (218) 175 171
Noncontrolling Interests, net of tax (38) 12 14
Total other comprehensive income (loss), net of tax $ (256) $ 187 $ 185