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Acquisitions and Divestitures - Divestitures (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2021 businessDivested | Sep. 30, 2020 USD ($)
Business Combination and Asset Acquisition [Abstract] |  |
Number of businesses sold | businessDivested | 0 |
Operating income of businesses held for sale | $ |  | $ 40

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- Definition This element represents the total amount of businesses sold in the reporting period. + References No definition available. + Details
Name: | mmm_NumberOfBusinessesDivested
Namespace Prefix: | mmm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_BusinessCombinationAndAssetAcquisitionAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of operating income (loss) attributable to disposal group, including, but not limited to, discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration