Consolidated Statements of Shareholders' 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	Treasury Shares Amount
Beginning balance (in shares) at Dec. 31, 2020		1,000	89,457
Beginning balance at Dec. 31, 2020	$ 2,504	$ 0	$ 1	$ 1,126	$ 1,434	$ 2,503	$ 1	$ (58)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued / (surrendered) under incentive compensation plan (in shares)			1,244
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(20)			(20)		(20)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	29			29		29
Repurchase of common stock (in shares)			16,924
Repurchase of common stock, including excise tax	(572)					(572)		(572)
Stock Repurchased and Retired During Period, Shares		(1,000)
Stock Repurchased and Retired During Period, Value	(28)			(19)	(9)	(28)
Net income	1,454				1,454	1,454	0
Ending balance (in shares) at Dec. 31, 2021		0	73,777
Ending balance at Dec. 31, 2021	3,367	$ 0	$ 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		0	69,266
Ending balance at Dec. 31, 2022	4,057	$ 0	$ 1	1,104	3,802	4,057	0	(850)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends paid to noncontrolling interests	(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		0	64,599
Ending balance at Dec. 31, 2023	$ 4,282	$ 0	$ 1	$ 1,087	$ 4,302	$ 4,282	$ 0	$ (1,108)