Income Taxes - Carryforward and Temporary Differences (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred Tax Assets
Goodwill and intangible assets	$ 998	$ 728
Loss carryforwards (federal, state & capital)	134	558
Loss reserves	104	115
Lease liability	30	26
Accruals	16	24
Other, net	20	52
Total deferred tax assets	1,302	1,503
Deferred Tax Liabilities
MSR amortization and mark-to-market, net	(240)	(117)
Right-of-use assets	(27)	(23)
Depreciation and amortization, net	(19)	(13)
Prepaid assets	(2)	(2)
Other, net	(14)	0
Total deferred tax liabilities	(302)	(155)
Valuation allowance	(9)	(9)
Deferred tax assets, net	$ 991	$ 1,339