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Business Segments (Details) | 9 Months Ended
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Sep. 30, 2018 segment
Business Segments |
Number of business segments | 5
Percentage of net sales for countries that centralized sales districts to overall international net sales | 70.00%

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- Definition The ratio of net sales related to countries that expanded dual credit to overall international net sales. + References No definition available. + Details
Name: | mmm_PercentOfCountryNetSalesToOverallInternationalNetSalesRelatedToCentralizedSalesDistricts
Namespace Prefix: | mmm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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