Advances and Other Receivables - Schedule of Accounts Receivable (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Receivables [Abstract]
Servicing advances, net of $5 and $6 purchase discount, respectively	$ 1,202	$ 1,410
Receivables from agencies, investors and prior servicers	38	47
Reserves	(116)	(112)
Total advances and other receivables, net	$ 1,124	$ 1,345