Cover Page - shares	9 Months Ended
	Sep. 30, 2023	Oct. 20, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	001-14667
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 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		65,860,343
Entity Central Index Key	0000933136
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Amendment Flag	false