Investments in Servicing Related Assets, Portfolio of Servicing Related Assets (Details) $ in Billions	Mar. 31, 2022 USD ($)
Mortgage Servicing Rights (MSRs) [Member] \| Aurora Financial Group, Inc. [Member]
Mortgage Loans on Real Estate [Abstract]
Aggregate unpaid principal balance	$ 20.4

Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column G))
-URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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