Advances and Other Receivables - Schedule of Accounts Receivable (Details) - USD ($) $ in Millions	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Receivables [Abstract]
Servicing advances, net of $12 and $13 purchase discount	$ 1,023		$ 1,065
Receivables from agencies, investors and prior servicers, net of zero and $6 purchase discount	60		101
Reserves	(149)		(170)
Total advances and other receivables, net	934		996
Servicing advances discount	12	$ 12	13	$ 9	$ 9	$ 12
Receivables discount	$ 0	$ 0	$ 6	$ 7	$ 7	$ 7