SEGMENT REPORTING - Narrative (Details) $ in Billions	Sep. 30, 2021 USD ($)
Servicing \| Newrez And Caliber
Segment Reporting Information [Line Items]
Residential mortgage loan UPB	$ 385.2
Servicing \| Third party
Segment Reporting Information [Line Items]
MSRs	75.8
MSR Related Investments \| Third party
Segment Reporting Information [Line Items]
Residential mortgage loan UPB	$ 164.7

Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

Name:	us-gaap_ServicingAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant