Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Total Mr. Cooper Stockholders’ Equity	Non-controlling Interests	Treasury Shares Amount
Beginning balance (in shares) at Dec. 31, 2021		73,777
Beginning balance at Dec. 31, 2021	$ 3,367	$ 1	$ 1,116	$ 2,879	$ 3,366	$ 1	$ (630)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued / (surrendered) under incentive compensation plan (in shares)		906
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(22)		(41)		(22)		19
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	29		29		29
Repurchase of common stock (in shares)		5,417
Repurchase of common stock, including excise tax	(239)				(239)		(239)
Net income	923			923	923	0
Ending balance (in shares) at Dec. 31, 2022		69,266
Ending balance at Dec. 31, 2022	4,057	$ 1	1,104	3,802	4,057	0	(850)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	1					1
Shares issued / (surrendered) under incentive compensation plan (in shares)		910
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(25)		(45)		(25)		20
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	28		28		28
Repurchase of common stock (in shares)		5,577
Repurchase of common stock, including excise tax	(278)				(278)		(278)
Net income	500			500	500	0
Ending balance (in shares) at Dec. 31, 2023		64,599
Ending balance at Dec. 31, 2023	4,282	$ 1	1,087	4,302	4,282	0	(1,108)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued / (surrendered) under incentive compensation plan (in shares)		739
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(27)		(47)		(27)		20
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	37		37		37
Repurchase of common stock (in shares)		1,757
Repurchase of common stock, including excise tax	(148)				(148)		(148)
Net income	669			669	669	0
Ending balance (in shares) at Dec. 31, 2024		63,581
Ending balance at Dec. 31, 2024	$ 4,813	$ 1	$ 1,077	$ 4,971	$ 4,813	$ 0	$ (1,236)