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Leases - Disclosures related to periods prior to adoption of new lease standard (Details) £ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2003 GBP (£)
Capital and Operating Leases |  |  |  |
Rental expense under operating leases | $ 393 | $ 343 | $ 318 |
Capital lease asset and obligation | 92 |  |  |
Building in United Kingdom |  |  |  |
Capital and Operating Leases |  |  |  |
Capital lease asset and obligation | 43 |  |  | £ 34
Capital lease term (in years) |  |  |  | 22 years
Capital lease obligations in aggregate |  |  |  |
Capital and Operating Leases |  |  |  |
Capital lease asset and obligation | $ 13 | $ 13 | $ 12 |
Capital lease term (in years) | 15 years |  |  |

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- Definition This element represents the capital lease term, in years. + References No definition available. + Details
Name: | mmm_CapitalLeaseTermYears
Namespace Prefix: | mmm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_CapitalLeasedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
Name: | us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | mmm_CapitalLeasedAssetTypeAxis=us-gaap_BuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | mmm_CapitalLeasedAssetTypeAxis=mmm_InAggregateCapitalLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |