Advances and Other Receivables - Purchase Discount (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Servicing Advances
Servicing Advances, Discount	$ 16	$ 63	$ 19	$ 72
Accretion of Service Advances Discount	(2)	(37)	(5)	(46)
Servicing Advances, Discount	14	26	14	26
Receivables from Agencies, Investors and Prior Servicers
Receivable with Imputed Interest, Discount	8	20	8	20
Receivable Discount, Accretion Expense	0	0	(4)	(1)
Receivable with Imputed Interest, Discount	$ 8	$ 20	$ 12	$ 21