Advances and Other Receivables - Purchase Discount (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Servicing Advances
Balance - beginning of year	$ 13	$ 12
Addition from acquisition(1)	0	5
Utilization of purchase discounts	(7)	(4)
Balance - end of year	6	13
Receivables from Agencies, Investors and Prior Servicers
Balance - beginning of year	6	7
Addition from acquisition(1)	0	0
Utilization of purchase discounts	(6)	(1)
Balance - end of year	0	6
Accounts, Notes, Loans and Financing Receivable [Line Items]
Addition from acquisition(1)	$ 0	5
Home Point Capital Inc
Servicing Advances
Addition from acquisition(1)		5
Accounts, Notes, Loans and Financing Receivable [Line Items]
Addition from acquisition(1)		$ 5

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://www.xbrl.org/2003/role/exampleRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 55
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482949/835-30-55-8

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482900/835-30-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-1A

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