Advances and Other Receivables - Purchase Discount (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Servicing Advances
Servicing Advances, Discount	$ 12	$ 9	$ 13	$ 12
Additions	(5)	(1)	(6)	(4)
Servicing Advances, Discount	7	12	7	12
Receivables from Agencies, Investors and Prior Servicers
Receivable with Imputed Interest, Discount	0	7	0	7
Utilization of Purchase Discount	0	0	(6)	0
Receivable with Imputed Interest, Discount	0	7	6	7
Accounts, Notes, Loans and Financing Receivable [Line Items]
Servicing advances discount	7	12	7	12
Receivables discount	0	7	0	7
Accretion of Service Advances Discount	5	1	6	4
Receivable Discount, Accretion Expense	$ 0	0	$ 6	0
Home Point Capital Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Addition to Servicing Advances Discount		$ 4		$ 4