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Leases - Operating leases not yet commenced (Details) $ in Millions | Dec. 31, 2021 USD ($)
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Leases [Abstract] |
Additional operating lease commitments that have not yet commenced | $ 18

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- Definition Lessee, Operating Lease, Lease Not yet Commenced, Liability + References No definition available. + Details
Name: | mmm_LesseeOperatingLeaseLeaseNotYetCommencedLiability
Namespace Prefix: | mmm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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