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Supplemental Equity and Comprehensive Income Information (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Amount Reclassified from Accumulated Other Comprehensive Income      
Selling, general and administrative expenses $ (6,384) $ (6,102) $ (6,170)
Total before tax 1,492 481 (2,146)
Tax effect (1,841) (1,840) (1,674)
Net of tax 5,496 4,719 2,801
Reclassifications out of Accumulated Other Comprehensive Income Attributable to 3M
     
Amount Reclassified from Accumulated Other Comprehensive Income      
Net of tax (449) (350) (392)
Defined Benefit Pension and Postretirement Plans Adjustment
     
Amount Reclassified from Accumulated Other Comprehensive Income      
Total before tax 1,930 411 (1,977)
Defined Benefit Pension and Postretirement Plans Adjustment | Reclassifications out of Accumulated Other Comprehensive Income Attributable to 3M
     
Amount Reclassified from Accumulated Other Comprehensive Income      
Transition asset 1 1 2
Prior service benefit 77 84 75
Net actuarial loss (647) (700) (552)
Total before tax (569) (615) (475)
Tax effect 197 219 168
Net of tax (372) (396) (307)
Debt and Equity Securities, Unrealized Gain (Loss)
     
Amount Reclassified from Accumulated Other Comprehensive Income      
Total before tax 0 6 0
Debt and Equity Securities, Unrealized Gain (Loss) | Reclassifications out of Accumulated Other Comprehensive Income Attributable to 3M
     
Amount Reclassified from Accumulated Other Comprehensive Income      
Selling, general and administrative expenses 0 0 (10)
Total before tax 0 0 (10)
Tax effect 0 0 4
Net of tax 0 0 (6)
Cash Flow Hedging Instruments Unrealized Gain (Loss)
     
Amount Reclassified from Accumulated Other Comprehensive Income      
Total before tax 24 (69) 84
Cash Flow Hedging Instruments Unrealized Gain (Loss) | Reclassifications out of Accumulated Other Comprehensive Income Attributable to 3M
     
Amount Reclassified from Accumulated Other Comprehensive Income      
Total before tax (122) 72 (123)
Tax effect 45 (26) 44
Net of tax (77) 46 (79)
Cash Flow Hedging Instruments Unrealized Gain (Loss) | Foreign currency forward/option contracts | Reclassifications out of Accumulated Other Comprehensive Income Attributable to 3M
     
Amount Reclassified from Accumulated Other Comprehensive Income      
Cost of sales (11) 41 (87)
Cash Flow Hedging Instruments Unrealized Gain (Loss) | Foreign currency forward contracts | Reclassifications out of Accumulated Other Comprehensive Income Attributable to 3M
     
Amount Reclassified from Accumulated Other Comprehensive Income      
Interest expense (108) 42 (30)
Cash Flow Hedging Instruments Unrealized Gain (Loss) | Commodity price swap contracts | Reclassifications out of Accumulated Other Comprehensive Income Attributable to 3M
     
Amount Reclassified from Accumulated Other Comprehensive Income      
Cost of sales (2) (10) (6)
Cash Flow Hedging Instruments Unrealized Gain (Loss) | Interest rate swap contracts | Reclassifications out of Accumulated Other Comprehensive Income Attributable to 3M
     
Amount Reclassified from Accumulated Other Comprehensive Income      
Interest expense $ (1) $ (1) $ 0