Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2020	Apr. 24, 2020
Document and Entity Information [Abstract]
Entity Registrant Name	Mr. Cooper Group Inc.
Entity Central Index Key	0000933136
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Emerging Growth Company	false
Small Business Entity	false
Document Type	10-Q
Document Period End Date	Mar. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Amendment Flag	false
Current Reporting Status	Yes
Entity Common Stock, Shares Outstanding		91,970,033
Entity Shell Company	false