Advances and Other Receivables - Purchase Discount (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Servicing Advances
Servicing Advances, Discount	$ 9	$ 14	$ 12	$ 19
Utilization of purchase discounts	(1)	(2)	(4)	(7)
Servicing Advances, Discount	12	12	12	12
Receivables from Agencies, Investors and Prior Servicers
Receivable with Imputed Interest, Discount	7	7	7	7
Utilization of purchase discounts	0	(1)	0	(5)
Receivable with Imputed Interest, Discount	7	8	7	12
Home Point Capital Inc [Member]
Servicing Advances
Addition from acquisition(1)	0	0	0	0
Addition from acquisition(1)	4	0	4	0
Accounts, Notes, Loans and Financing Receivable [Line Items]
Addition from acquisition(1)	4	0	4	0
Addition from acquisition(1)	$ 0	$ 0	$ 0	$ 0