v3.26.1
Cover - shares
 3 Months Ended
Mar. 31, 2026
Apr. 27, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2026  
Document Transition Report false  
Entity File Number 001-40235  
Entity Registrant Name Organon & Co.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 46-4838035  
Entity Address, Address Line One 30 Hudson Street, Floor 33  
Entity Address, City or Town Jersey City,  
Entity Address, State or Province NJ  
Entity Address, Postal Zip Code 07302  
City Area Code (551)  
Local Phone Number 430-6900  
Title of 12(b) Security Common Stock ($0.01 par value)  
Trading Symbol OGN  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   262,600,862
Entity Central Index Key 0001821825  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1