Advances and Other Receivables - Schedule of Accounts Receivable (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Receivables [Abstract]
Servicing advances, net of $12 and $19 purchase discount, respectively	$ 1,053	$ 1,263
Receivables from agencies, investors and prior servicers, net of $7 and $12 purchase discount, respectively	103	132
Reserves	(137)	(167)
Total advances and other receivables, net	1,019	1,228
Servicing advances discount	12	19	$ 72
Receivable discount	$ 7	$ 12	$ 21