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Quarterly Data (Unaudited)
12 Months Ended
Dec. 31, 2012
Quarterly Data (Unaudited)  
Quarterly Data (Unaudited)

NOTE 17. Quarterly Data (Unaudited)

                 
(Millions, except per-share amounts) First Second Third Fourth Year
2012 Quarter Quarter Quarter Quarter 2012
Net sales $ 7,486 $ 7,534 $ 7,497 $ 7,387 $ 29,904
Cost of sales   3,889   3,870   3,935   3,991   15,685
Net income including noncontrolling interest   1,141   1,186   1,180   1,004   4,511
Net income attributable to 3M   1,125   1,167   1,161   991   4,444
Earnings per share attributable to 3M               
 common shareholders - basic   1.61   1.68   1.68   1.43   6.40
Earnings per share attributable to 3M               
 common shareholders - diluted   1.59   1.66   1.65   1.41   6.32
                 
(Millions, except per-share amounts) First Second Third Fourth Year
2011 Quarter Quarter Quarter Quarter 2011
Net sales $ 7,311 $ 7,680 $ 7,531 $ 7,089 $ 29,611
Cost of sales   3,802   4,040   4,027   3,824   15,693
Net income including noncontrolling interest   1,103   1,177   1,103   974   4,357
Net income attributable to 3M   1,081   1,160   1,088   954   4,283
Earnings per share attributable to 3M               
 common shareholders - basic   1.52   1.63   1.54   1.36   6.05
Earnings per share attributable to 3M               
 common shareholders - diluted   1.49   1.60   1.52   1.35   5.96

Gross profit is calculated as net sales minus cost of sales.