Commitments and Contingencies - Environmental (Details)	1 Months Ended															3 Months Ended		4 Months Ended	6 Months Ended
	Mar. 31, 2024 USD ($) lawsuit party plaintiff	Feb. 29, 2024 lawsuit	Jan. 31, 2024 lawsuit	Dec. 31, 2023 plaintiff	Oct. 31, 2023 lawsuit	Aug. 31, 2023 lawsuit	May 31, 2023 EUR (€) party	Mar. 31, 2023 party	Feb. 28, 2023 plaintiff	Jul. 31, 2022 EUR (€)	Jun. 30, 2020 lawsuit	Jun. 30, 2019 lawsuit	May 31, 2019 lawsuit	Mar. 31, 2019 facility lawsuit	Jul. 31, 2018 USD ($) defendant facility chemical mi	Mar. 31, 2024 USD ($) lawsuit party case perfluorinated_material	Sep. 30, 2023 USD ($)	Mar. 31, 2024 USD ($) lawsuit injury party plaintiff	Jun. 30, 2022 USD ($)	Nov. 30, 2021 USD ($)
Product Liability Litigation
Increase in liabilities, gross										€ 571,000,000									$ 500,000,000
Belgian Civil Litigation
Product Liability Litigation
Number of lawsuits pending | party	16															16		16
Settlement amount paid | €							€ 500
Number of family members awarded | party							4
Total number of named claimants | plaintiff				1,400
City of Muscle Shoals, Alabama vs. 3M | Pending Litigation
Product Liability Litigation
Total number of named claimants | plaintiff									2									26
Number of personal injury actions against 3M | injury																		6
Number of plaintiffs moved to remand | plaintiff																		4
PFAS Contamination
Product Liability Litigation
Number of lawsuits filed		2	2		2	2	2	2
PWS Settlement | Pending Litigation
Product Liability Litigation
Total number of named claimants | plaintiff	25			25
Estimate of possible settlement amount | $	$ 12,500,000,000															$ 12,500,000,000		$ 12,500,000,000
Pre-tax charge on settlement | $																	$ 10,300,000,000
Present value of possible loss	5.20%															5.20%		5.20%
Minimum | PWS Settlement | Pending Litigation
Product Liability Litigation
Estimate of possible settlement amount | $	$ 10,500,000,000															$ 10,500,000,000		$ 10,500,000,000
Maximum | PWS Settlement | Pending Litigation
Product Liability Litigation
Estimate of possible settlement amount | $	$ 12,500,000,000															$ 12,500,000,000		$ 12,500,000,000
City of Decatur, Decatur Utilities, and Morgan County
Product Liability Litigation
Investment plan for environmental remediation | $																				$ 99,000,000
Environmental Matters - Regulatory Activities
Product Liability Litigation
Number of years after phase-out decision in May 2000 that the Company stopped manufacturing and using vast majority of perfluorooctanyl compounds																2 years
Environmental Matters - Litigation | New Jersey
Product Liability Litigation
Number of lawsuits filed											2			2
Number of additional new claims filed											2
Environmental Matters - Litigation | Salem County, New Jersey
Product Liability Litigation
Number of facilities related to the manufacture and disposal of PFAS | facility														2
Environmental Matters - Litigation | New Hampshire
Product Liability Litigation
Number of lawsuits filed													2
Environmental Matters - Litigation | Vermont
Product Liability Litigation
Number of lawsuits filed												2
Environmental Matters - Litigation | Illinois
Product Liability Litigation
Number of lawsuits filed												2
Environmental Matters - Aqueous Film Forming Foam Litigation
Product Liability Litigation
Number of putative class action and other lawsuits																7,844
Number of class action lawsuits																50
Number of public water system lawsuits	746															746		746
Environmental Matters - Aqueous Film Forming Foam Litigation | Various state courts
Product Liability Litigation
Number of lawsuits pending	5															5		5
Number of lawsuits filed												8
Number of lawsuits served																104
Environmental Matters - Aqueous Film Forming Foam Litigation | Federal court
Product Liability Litigation
Number of lawsuits pending	2															2		2
Environmental Matters - Other PFAS-related Environmental Litigation
Product Liability Litigation
Increase (decrease) accrued loss contingency reserve | $																$ 163,000,000
Litigation payments | $																$ 61,000,000
Environmental Matters - Other PFAS-related Environmental Litigation | New Jersey
Product Liability Litigation
Number of lawsuits filed																28
Number of lawsuits seeking medical monitoring and damages | case																10
Environmental Matters - Other PFAS-related Environmental Litigation | U.S. District Court of Eastern District of New York
Product Liability Litigation
Number of lawsuits pending	22															22		22
Environmental Matters - Other PFAS-related Environmental Litigation | Alabama and Georgia
Product Liability Litigation
Number of putative class action and other lawsuits																3
Environmental Matters - Other PFAS-related Environmental Litigation | Delaware.
Product Liability Litigation
Number of putative class action and other lawsuits																1
Environmental Matters - Other PFAS-related Environmental Litigation | Decatur, Alabama
Product Liability Litigation
Number of perfluorinated materials (FBSA and FBSEE) | perfluorinated_material																2
Environmental Matters Other Pfc Related Environmental Litigation, Individual Cases | New Jersey
Product Liability Litigation
Number of lawsuits filed																18
Environmental Matters - Other Environmental Litigation
Product Liability Litigation
Accrued loss contingency reserve | $	$ 11,100,000,000															$ 11,100,000,000		$ 11,100,000,000
Environmental Matters - Other Environmental Litigation | Other current liabilities
Product Liability Litigation
Accrued loss contingency reserve | $	3,000,000,000															3,000,000,000		3,000,000,000
Environmental Matters - Other Environmental Litigation | Other liabilities
Product Liability Litigation
Accrued loss contingency reserve | $	8,100,000,000															8,100,000,000		8,100,000,000
Environmental Matters - Other Environmental Litigation | New Jersey
Product Liability Litigation
Approximate number of miles of a river seeking to be cleaned | mi															8
The value the award the plaintiff seeks | $															$ 165,000,000
Number of chemicals of concern in the sediment | chemical															8
Number of commercial drum conditioning facilities | facility															2
Environmental Matters - Other Environmental Litigation | New Jersey | Minimum
Product Liability Litigation
Number of unnamed defendant | defendant															120
Environmental Matters - Remediation
Product Liability Litigation
Accrued loss contingency reserve | $	36,000,000															$ 36,000,000		36,000,000
Number of years remediation payments expected to be paid for applicable sites																20 years
Environmental Matters - Other
Product Liability Litigation
Accrued loss contingency reserve | $	$ 0															$ 0		$ 0