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v3.20.2

Significant Accounting Policies - Accounts Receivable (Details) | 9 Months Ended
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Sep. 30, 2020
Maximum |
Accounts receivable and allowances |
Number of years of origination of receivables | 5 years

X
- Definition The number of years in which the origination dates of receivables date back to. + References No definition available. + Details
Name: | mmm_NumberOfYearsInWhichOriginationDatesOfReceivablesDateBackTo
Namespace Prefix: | mmm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- 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_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |