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Significant Accounting Policies - Accounts receivable and Allowances (Details) | 12 Months Ended
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Dec. 31, 2021
Accounts receivable and allowance |
Typical origination term for long-term customer receivables (in years) | 5 years

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- Definition The typical origination term for long-term customer receivables. + References No definition available. + Details
Name: | mmm_LongTermCustomerReceivablesOriginationTermMaximum
Namespace Prefix: | mmm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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