Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Service related, net	$ 1,067	$ 379	$ 829
Net gain on mortgage loans held for sale	2,251	2,310	1,098
Total revenues	3,318	2,689	1,927
Expenses:
Salaries, wages and benefits	1,036	1,027	893
General and administrative	626	755	821
Total expenses	1,662	1,782	1,714
Interest income	231	158	291
Interest expense	(478)	(528)	(543)
Other income (expense), net	528	(135)	15
Total other income (expenses), net	281	(505)	(237)
Income (loss) from continuing operations before income tax expense (benefit)	1,937	402	(24)
Less: Income tax expense (benefit)	471	93	(278)
Net income from continuing operations	1,466	309	254
Net (loss) income from discontinued operations	(12)	(2)	16
Net income	1,454	307	270
Less: Net income (loss) attributable to non-controlling interests	0	2	(4)
Net income attributable to Mr. Cooper	1,454	305	274
Less: Undistributed earnings attributable to participating stockholders	8	3	2
Less: Premium on retirement of preferred stock	28	0	0
Net income attributable to common stockholders	$ 1,418	$ 302	$ 272
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Per Basic Share	$ 17.39	$ 3.33	$ 2.81
Income (Loss) from Continuing Operations, Per Diluted Share	16.67	3.22	2.78
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	(0.15)	(0.02)	0.18
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share	(0.14)	(0.02)	0.17
Earnings Per Share, Basic	17.24	3.31	2.99
Earnings Per Share, Diluted	$ 16.53	$ 3.20	$ 2.95