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v3.19.3

Leases - Operating leases not yet commenced (Details) $ in Millions | Sep. 30, 2019 USD ($)
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Leases |
Additional operating lease commitments that have not yet commenced | $ 29

X
- Definition The value of the lessee's operating lease which has not yet commenced. + References No definition available. + Details
Name: | mmm_LesseeOperatingLeaseLeaseNotYetCommencedAmount
Namespace Prefix: | mmm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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