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Significant Accounting Policies - PP&E (Details) | 12 Months Ended
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Dec. 31, 2021
Buildings and improvements | Minimum |
Property, plant and equipment |
Estimated useful life (in years) | 10 years
Majority of estimated useful life (in years) | 20 years
Buildings and improvements | Maximum |
Property, plant and equipment |
Estimated useful life (in years) | 40 years
Majority of estimated useful life (in years) | 40 years
Machinery and equipment | Minimum |
Property, plant and equipment |
Estimated useful life (in years) | 3 years
Majority of estimated useful life (in years) | 5 years
Machinery and equipment | Maximum |
Property, plant and equipment |
Estimated useful life (in years) | 15 years
Majority of estimated useful life (in years) | 10 years

X
- Definition The useful life of the majority of long-lived, physical assets used in the normal conduct of business. + References No definition available. + Details
Name: | mmm_PropertyPlantAndEquipmentUsefulLifeMajority
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_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingAndBuildingImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_MachineryAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |