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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2023
Feb. 22, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-35449    
Entity Registrant Name Mr. Cooper Group Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 91-1653725    
Entity Address, Address Line One 8950 Cypress Waters Blvd    
Entity Address, City or Town Coppell    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 75019    
City Area Code 469    
Local Phone Number 549-2000    
Title of 12(b) Security Common Stock, $0.01 par value per share    
Trading Symbol COOP    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   64,602,234  
Entity Public Float     $ 3,275,695,445
Documents Incorporated by Reference
Portions of our definitive Proxy Statement, to be filed with the Securities and Exchange Commission pursuant to Regulation 14A within 120 days of the Company’s fiscal year-end, are incorporated by reference into Part III, Items 10-14 of this Annual Report on Form 10-K.
    
Entity Central Index Key 0000933136    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false    
Document Financial Statement Error Correction [Flag] false