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Supplemental Equity and Comprehensive Income Information - Dividends (Details) - $ / shares | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Supplemental Equity and Comprehensive Income Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends that have been declared but paid in subsequent period (in dollars per share) | $ 1.025 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared in current period (in dollars per share) |  | $ 1.175 | $ 1.175 | $ 1.175 | $ 1.175 | $ 1.11 | $ 1.11 | $ 1.11 | $ 1.11 | $ 1.025 | $ 1.025 | $ 1.025 | $ 4.70 | $ 4.44 | $ 3.075

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- Definition Dividends that have been declared in the current reporting period but are not paid until a subsequent reporting period and reside on the balance sheet until the date paid. + References No definition available. + Details
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Namespace Prefix: | mmm_
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Balance Type: | na
Period Type: | duration

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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