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v3.20.1

Significant Accounting Policies - Accounts Receivable (Details) - Maximum $ in Millions | 3 Months Ended
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Mar. 31, 2020 USD ($)
Accounts receivable and allowances |
Long-term receivables | $ 100
Number of years of origination of receivables | 5 years

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

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- Definition Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Balance Type: |
Period Type: |