Unaudited Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues:
Service related, net	$ 460	$ (8)	$ 1,215	$ 572
Net gain on mortgage loans held for sale	139	582	436	1,261
Total revenues	599	574	1,651	1,833
Expenses:
Salaries, wages and benefits	203	277	431	554
General and administrative	125	148	235	325
Total expenses	328	425	666	879
Interest income	50	51	86	97
Interest expense	(111)	(119)	(217)	(245)
Other (expense) income, net	(5)	486	217	486
Total other (expense) income, net	(66)	418	86	338
Income (loss) from continuing operations before income tax expense (benefit)	205	567	1,071	1,292
Less: Income tax expense	54	140	262	306
Net income from continuing operations	151	427	809	986
Net income from discontinued operations	0	12	0	14
Net income	151	439	809	1,000
Less: Undistributed earnings attributable to participating stockholders	0	4	0	9
Net income attributable to common stockholders	$ 151	$ 435	$ 809	$ 991
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Per Basic Share	$ 2.08	$ 4.91	$ 11.04	$ 11.13
Income (Loss) from Continuing Operations, Per Diluted Share	2.03	4.72	10.74	10.65
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	0	0.14	0	0.16
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share	0	0.13	0	0.15
Basic (in dollars per share)	2.08	5.05	11.04	11.29
Diluted (in dollars per share)	$ 2.03	$ 4.85	$ 10.74	$ 10.80