Loss Contingency, Matters Involved, Number

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- Definition

Loss Contingency, Number Of Plaintiffs To Decline Settlement Offer

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- Definition

Loss Contingency, Unfiled Claims, Number

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- Definition

Minimum Percentage Of Attorneys’ Eligible Clients To Release

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- Definition

Number Of Shareholder Derivative Lawsuits Filed

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- Definition

Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of plaintiffs that have filed claims pertaining to a loss contingency.

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Number of pending claims pertaining to a loss contingency.

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Contingencies (Details) $ in Millions	Mar. 12, 2026 plaintiff	Mar. 31, 2026 USD ($) case matter	Feb. 18, 2026	Dec. 31, 2025 USD ($)	Jul. 28, 2025	Jul. 22, 2025 lawsuit
Loss Contingencies [Line Items]
Number of shareholder derivative lawsuits filed \| lawsuit						2
Amount of legal defense reserves \| $		$ 9		$ 10
Northern District of Ohio
Loss Contingencies [Line Items]
Loss contingency, number of plaintiffs to decline settlement offer \| plaintiff	2
Number of plaintiffs \| plaintiff	56
Fosamax \| Federal Court
Loss Contingencies [Line Items]
Number of pending claims		508
Fosamax \| New Jersey State Court
Loss Contingencies [Line Items]
Number of pending claims		1,482
Fosamax \| Pennsylvania State Court
Loss Contingencies [Line Items]
Number of pending claims		1
Fosamax \| California State Court
Loss Contingencies [Line Items]
Number of pending claims		219
Fosamax \| California State Court \| Femur Fracture Litigation
Loss Contingencies [Line Items]
Minimum percentage of attorneys’ eligible clients to release the company and merck of any liability related to their filed claims			95.00%
Fosamax \| Femur Fracture MDL Court \| Femur Fracture Litigation
Loss Contingencies [Line Items]
Minimum percentage of attorneys’ eligible clients to release the company and merck of any liability related to their filed claims					95.00%
Implanon \| Int’l
Loss Contingencies [Line Items]
Number of pending claims		7
Implanon \| Northern District of Ohio
Loss Contingencies [Line Items]
Number of pending claims		2
Number of unfiled claims		56
Nexplanon \| CALIFORNIA
Loss Contingencies [Line Items]
Number of matters involved \| matter		1
Nexplanon \| Int’l
Loss Contingencies [Line Items]
Number of pending claims		12
Nexplanon/Implanon NXT \| Int’l
Loss Contingencies [Line Items]
Number of pending claims		19