Annual report pursuant to Section 13 and 15(d)

EARNINGS PER SHARE (Details)

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EARNINGS PER SHARE (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
EARNINGS PER SHARE      
Net income attributable to Cummins Inc. $ 1,848 $ 1,040 $ 428
Weighted-average commons shares outstanding:      
Basic (in shares) 192,972,211 196,699,115 197,445,998
Dilutive effect of stock compensation awards (in shares) 625,667 449,252 249,126
Diluted (in shares) 193,597,878 197,148,367 197,695,124
Earnings per common share attributable to Cummins Inc.      
Basic (in dollars per share) $ 9.58 $ 5.29 $ 2.17
Diluted (in dollars per share) $ 9.55 $ 5.28 $ 2.16
Weighted-average shares, common stock options excluded (in shares) 177,460 7,795 53,750