v3.26.1
Cover
12 Months Ended
Dec. 31, 2025
Document Information [Line Items]  
Document Type 11-K
Entity Registrant Name MERCK & CO., INC.
Entity Central Index Key 0000310158
Amendment Flag false
EBP 061  
Document Information [Line Items]  
Document Type 11-K
Entity tax identification number 98-0658260
Plan number 061
Entity Registrant Name MERCK & CO., INC.
Entity Central Index Key 0000310158
Amendment Flag false