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v3.20.1

Business Segments (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2020 USD ($) segment
Business Segment Information |
Number of business segments | segment | 4
Business Segments in Aggregate |
Business Segment Information |
Increase (decrease) in net sales due to continued alignment of customer account activity | $ (42)
Increase (decrease) in operating income due to continued alignment of customer account activity | (10)
Safety and Industrial |
Business Segment Information |
Increase (decrease) in net sales due to additional actions impacting business segment reporting | (35)
Increase (decrease) in operating income due to additional actions impacting business segment reporting | (11)
Consumer |
Business Segment Information |
Increase (decrease) in net sales due to additional actions impacting business segment reporting | 35
Increase (decrease) in operating income due to additional actions impacting business segment reporting | 11
Elimination of Dual Credit |
Business Segment Information |
Increase (decrease) in net sales due to continued alignment of customer account activity | (42)
Increase (decrease) in operating income due to continued alignment of customer account activity | $ (10)

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- Definition The element represents the increase or decrease in net sales related to additional actions impacting business segment reporting. + References No definition available. + Details
Name: | mmm_IncreaseDecreaseInNetSalesDueToAdditionalActionsImpactingBusinessSegmentReporting
Namespace Prefix: | mmm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The element represents the increase or decrease in net sales related to the continued alignment of customer account activity. + References No definition available. + Details
Name: | mmm_IncreaseDecreaseInNetSalesDueToContinuedAlignmentOfCustomerAccountActivity
Namespace Prefix: | mmm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The element represents the increase or decrease in operating income related to additional actions impacting business segment reporting. + References No definition available. + Details
Name: | mmm_IncreaseDecreaseInOperatingIncomeDueToAdditionalActionsImpactingBusinessSegmentReporting
Namespace Prefix: | mmm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The element represents the increase or decrease in operating income related to the continued alignment of customer account activity. + References No definition available. + Details
Name: | mmm_IncreaseDecreaseInOperatingIncomeDueToContinuedAlignmentOfCustomerAccountActivity
Namespace Prefix: | mmm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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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- 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_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mmm_BusinessSegmentsInAggregateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mmm_SafetyAndIndustrialSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mmm_ConsumerSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_IntersegmentEliminationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |