Long-Term Debt and Short-Term Borrowings - Narrative (Details) - USD ($)		3 Months Ended	9 Months Ended
		Sep. 30, 2025	Sep. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Dec. 31, 2021
Debt instrument [Line Items]
Repayments of long-term debt	[1]	$ 600,000,000	$ 1,800,000,000
Interest rate contracts
Debt instrument [Line Items]
Derivative, notional amount		400,000,000	400,000,000			$ 800,000,000
Cumulative amount of fair value hedging adjustment included in carrying value of hedged liabilities for		25,000,000	25,000,000
Fixed Rate Note
Debt instrument [Line Items]
Principal amount				$ 1,100,000,000
Four Point Eight Zero Percent Notes Due 2030
Debt instrument [Line Items]
Principal amount				$ 550,000,000
Coupon rate (as a percent)				4.80%
Five Point One Five Percent Notes Due 2035
Debt instrument [Line Items]
Principal amount				$ 550,000,000
Coupon rate (as a percent)				5.15%
Floating Rate Registered Note Due 2049
Debt instrument [Line Items]
Principal amount						500,000,000
Floating Rate Registered Note Due 2050
Debt instrument [Line Items]
Principal amount						300,000,000
Fixed Rate Registered Note Due 2049
Debt instrument [Line Items]
Principal amount						1,000,000,000
Fixed Rate Registered Note Due 2050
Debt instrument [Line Items]
Principal amount						$ 650,000,000
Commercial paper
Debt instrument [Line Items]
Commercial paper outstanding		$ 0	$ 0		$ 0

[1] The Consolidated Statements of Cash Flows include the results of continuing and discontinued operations and, therefore, also include cash and cash equivalents associated with Solventum through its April 2024 separation from 3M that were presented in current assets of discontinued operations in the 3M Consolidated Balance Sheet.