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, 2012
Dec. 31, 2011
Dec. 31, 2010
EARNINGS PER SHARE      
Net income attributable to Cummins Inc. $ 1,645 $ 1,848 $ 1,040
Weighted-average common shares outstanding:      
Basic (in shares) 189,286,821 192,972,211 196,699,155
Dilutive effect of stock compensation awards (in shares) 381,883 625,667 449,252
Diluted (in shares) 189,668,704 193,597,878 197,148,407
Earnings per common share attributable to Cummins Inc.      
Basic (in dollars per share) $ 8.69 $ 9.58 $ 5.29
Diluted (in dollars per share) $ 8.67 $ 9.55 $ 5.28
Weighted-average shares, common stock options excluded (in shares) 453,893 177,460 7,795