Advances and Other Receivables - Purchase Discount (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Servicing Advances
Balance - beginning of year	$ 72	$ 131
Utilization of purchase discounts	(53)	(59)
Balance - end of year	19	72
Receivables from Agencies, Investors and Prior Servicers
Balance - beginning of year	21	21
Utilization of purchase discounts	(9)	0
Balance - end of year	$ 12	$ 21

Disclosure of the unamortized amount of the discount on the note or receivable which is deducted from the face amount of the receivable or loan. The discount or premium is the difference between the present value and the face amount.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28541-108399

Name:	us-gaap_ReceivableWithImputedInterestDiscount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant