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Cover - USD ($)
 12 Months Ended
Dec. 31, 2024
Feb. 14, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Document Transition Report false    
Entity File Number 1-13219    
Entity Registrant Name Onity Group Inc.    
Entity Incorporation, State or Country Code FL    
Entity Tax Identification Number 65-0039856    
Entity Address, Address Line One 1661 Worthington Road, Suite 100    
Entity Address, City or Town West Palm Beach,    
Entity Address, State or Province FL    
Entity Address, Postal Zip Code 33409    
City Area Code 561    
Local Phone Number 682-8000    
Title of 12(b) Security Common Stock, $0.01 Par Value    
Trading Symbol ONIT    
Security Exchange Name NYSE    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 174,631,880
Entity Common Stock, Shares Outstanding   7,873,053  
Documents Incorporated by Reference
Documents incorporated by reference: Portions of our definitive Proxy Statement with respect to our Annual Meeting of Shareholders, which will be filed with the Securities and Exchange Commission within 120 days after the end of our fiscal year ended December 31, 2024, are incorporated by reference into Part III, Items 10 - 14.
    
Entity Central Index Key 0000873860    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Amendment Flag false    
Document Fiscal Year Focus 2024    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Document Financial Statement Error Correction [Flag] false