Unaudited Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Millions	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Total Mr. Cooper Stockholders’ Equity	Non-controlling Interests
Shares outstanding, beginning balance (in shares) at Dec. 31, 2018		1,000	90,821
Stockholders' equity, beginning balance at Dec. 31, 2018	$ 1,945	$ 0	$ 1	$ 1,093	$ 848	$ 1,942	$ 3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued / (surrendered) under incentive compensation plan (in shares)			221
Shares issued / (surrendered) under incentive compensation plan	(2)			(2)		(2)
Share-based compensation	4			4		4
Net loss	(186)				(186)	(186)
Stockholders' equity, ending balance at Mar. 31, 2019	1,761	$ 0	$ 1	1,095	662	1,758	3
Shares outstanding, ending balance (in shares) at Mar. 31, 2019		1,000	91,042
Shares outstanding, beginning balance (in shares) at Dec. 31, 2019		1,000	91,118
Stockholders' equity, beginning balance at Dec. 31, 2019	2,231	$ 0	$ 1	1,109	1,122	2,232	(1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued / (surrendered) under incentive compensation plan (in shares)			852
Shares issued / (surrendered) under incentive compensation plan	(5)			(5)		(5)
Share-based compensation	4			4		4
Net loss	(171)				(168)	(168)	(3)
Stockholders' equity, ending balance at Mar. 31, 2020	$ 2,066	$ 0	$ 1	$ 1,108	$ 961	$ 2,070	$ (4)
Shares outstanding, ending balance (in shares) at Mar. 31, 2020		1,000	91,970