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Supplemental Equity and Comprehensive Income Information (Details 3) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Components of Comprehensive Income (Loss) Attributable to 3M        
Net income attributable to 3M $ 1,167 $ 1,160 $ 2,292 $ 2,241
Cumulative translation (324) 205 (169) 426
Tax effect (22) 20 (22) 47
Cumulative translation - net of tax (346) 225 (191) 473
Defined benefit pension and postretirement plans adjustment 154 119 307 238
Tax effect (56) (66) (112) (109)
Defined benefit pension and postretirement plans adjustment - net of tax 98 53 195 129
Debt and equity securities, unrealized gain (loss) (3) (3) 2 (5)
Tax effect 1 1 (1) 2
Debt and equity securities, unrealized gain (loss) - net of tax (2) (2) 1 (3)
Cash flow hedging instruments, unrealized gain (loss) 37 1 13 (26)
Tax effect (14) (1) (5) 9
Cash flow hedging instruments, unrealized gain (loss) - net of tax 23 0 8 (17)
Comprehensive income (loss) attributable to 3M 940 1,436 2,305 2,823
Reclassification to earnings from accumulated other comprehensive income including noncontrolling interest that related to pension and postretirement expense in the income statement, before tax 154 119 307 238
Reclassification to earnings from accumulated other comprehensive income including noncontrolling interest that related to pension and postretirement expense in the income statement, after tax 98 54 195 130
Reclassification to earnings from accumulated other comprehensive income to gain (loss) on debt and equity securities in the income statement, before tax   2 (1) 2
Reclassification to earnings from accumulated other comprehensive income to gain (loss) on debt and equity securities in the income statement, after tax   $ 1 $ (1) $ 1