Unaudited Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues:
Service related, net	$ (8)	$ 0	$ 572	$ (67)
Net gain on mortgage loans held for sale	582	618	1,261	949
Total revenues	574	618	1,833	882
Expenses:
Salaries, wages and benefits	277	238	554	472
General and administrative	148	160	325	350
Total expenses	425	398	879	822
Interest income	51	22	97	97
Interest expense	(119)	(127)	(245)	(266)
Other income, net	486	0	486	1
Total other income (expenses), net	418	(105)	338	(168)
Income (loss) from continuing operations before income tax expense (benefit)	567	115	1,292	(108)
Less: Income tax expense (benefit)	140	38	306	(26)
Net income (loss) from continuing operations	427	77	986	(82)
Net income (loss) from discontinued operations	12	(4)	14	(16)
Net income (loss)	439	73	1,000	(98)
Less: Net loss attributable to non-controlling interests	0	0	0	(3)
Net income (loss) attributable to Mr. Cooper	439	73	1,000	(95)
Less: Undistributed earnings attributable to participating stockholders	4	1	9	0
Net income (loss) attributable to common stockholders	$ 435	$ 72	$ 991	$ (95)
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Per Basic Share	$ 4.91	$ 0.82	$ 11.13	$ (0.86)
Income (Loss) from Continuing Operations, Per Diluted Share	4.72	0.81	10.65	(0.86)
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	0.14	(0.04)	0.16	(0.18)
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share	0.13	(0.04)	0.15	(0.18)
Basic (in dollars per share)	5.05	0.78	11.29	(1.04)
Diluted (in dollars per share)	$ 4.85	$ 0.77	$ 10.80	$ (1.04)