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

Lessee, Operating Lease, Lease Not yet Commenced, Liability

No definition available.

Name:	mmm_LesseeOperatingLeaseLeaseNotYetCommencedLiability
Namespace Prefix:	mmm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant