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Acquisitions (Details)
12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Acquisition
Dec. 31, 2013
USD ($)
Acquisition
Dec. 31, 2012
USD ($)
Acquisition
Sep. 30, 2014
Sumitomo 3M Limited [Member]
JPY (¥)
Dec. 31, 2014
Maximum [Member]
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2014
Minimum [Member]
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2014
Weighted Average [Member]
Dec. 31, 2012
Weighted Average [Member]
Dec. 31, 2014
Static control business
USD ($)
Dec. 31, 2012
Other Acquisitions
USD ($)
Sep. 30, 2012
Federal Signal Technologies Group
USD ($)
Dec. 31, 2012
Ceradyne Inc.
USD ($)
Business Acquisitions Information                            
Accounts receivable     $ 84,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables                 $ 29,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
  $ 55,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= mmm_CeradyneIncMember
Inventory     125,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory                 13,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
  112,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= mmm_CeradyneIncMember
Other current assets     37,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets                 1,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
  36,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= mmm_CeradyneIncMember
Marketable securities     250,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities                 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
  250,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities
/ us-gaap_BusinessAcquisitionAxis
= mmm_CeradyneIncMember
Property, plant and equipment     241,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment                 3,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
  238,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= mmm_CeradyneIncMember
Purchased finite-lived intangible assets 34,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles   213,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles                 86,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
  127,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= mmm_CeradyneIncMember
Purchased indefinite-lived intangible assets     2,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets                 2,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
  0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= mmm_CeradyneIncMember
Purchased goodwill     339,000,000mmm_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount1                 141,000,000mmm_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount1
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
  198,000,000mmm_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount1
/ us-gaap_BusinessAcquisitionAxis
= mmm_CeradyneIncMember
Accounts payable and other liabilities, net of other assets     (127,000,000)mmm_BusinessAcquisitionPurchasePriceAllocationAccountsPayableAndOtherLiabilitiesNetOfOtherAssets                 (27,000,000)mmm_BusinessAcquisitionPurchasePriceAllocationAccountsPayableAndOtherLiabilitiesNetOfOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
  (100,000,000)mmm_BusinessAcquisitionPurchasePriceAllocationAccountsPayableAndOtherLiabilitiesNetOfOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= mmm_CeradyneIncMember
Interest bearing debt     (96,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt                 (3,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
  (93,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= mmm_CeradyneIncMember
Deferred tax asset/(liability)     (22,000,000)mmm_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxAssetLiabilityNet                 3,000,000mmm_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxAssetLiabilityNet
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
  (25,000,000)mmm_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxAssetLiabilityNet
/ us-gaap_BusinessAcquisitionAxis
= mmm_CeradyneIncMember
Net assets acquired     1,046,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet                 248,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
  798,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= mmm_CeradyneIncMember
Supplemental information:                            
Cash paid     1,098,000,000us-gaap_PaymentsToAcquireBusinessesGross                 248,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
  850,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= mmm_CeradyneIncMember
Less: Cash acquired     52,000,000us-gaap_CashAcquiredFromAcquisition                 0us-gaap_CashAcquiredFromAcquisition
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
  52,000,000us-gaap_CashAcquiredFromAcquisition
/ us-gaap_BusinessAcquisitionAxis
= mmm_CeradyneIncMember
Cash paid, net of cash acquired 94,000,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired 1,046,000,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired                 248,000,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
104,000,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= mmm_FederalSignalTechnologiesGroupMember
798,000,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= mmm_CeradyneIncMember
Number of business combinations completed 1us-gaap_NumberOfBusinessesAcquired 0us-gaap_NumberOfBusinessesAcquired 3us-gaap_NumberOfBusinessesAcquired                      
Sales of static business                     46,000,000mmm_SalesAssociatedWithDivestedBusiness
/ us-gaap_SubsegmentsAxis
= mmm_StaticControlBusinessMember
     
Finite Lived Intangible Assets                            
Intangible assets useful life         10 years 20 years 3 years 2 years 6 years 12 years        
Transactions with 3M subsidiaries that have non controlling interests                            
Percent of interest acquired of Sumitomo 3M Limited       25.00%mmm_MinorityInterestOwnershipPercentageByParentAcquired
/ dei_LegalEntityAxis
= mmm_Sumitomo3MLimitedMember
                   
Amount of acquisition for remaining non-controlling interest       ¥ 90,000,000,000mmm_AmountOfAcquistionForRemainingNoncontrollingInterest
/ dei_LegalEntityAxis
= mmm_Sumitomo3MLimitedMember