XML 103 R75.htm IDEA: XBRL DOCUMENT v3.25.3

Mortgage Servicing - Summary of Delinquency Status of Loans Underlying Mortgage Servicing Rights (Details) - USD ($) $ in Billions	Sep. 30, 2025	Dec. 31, 2024
Participating Mortgage Loans [Line Items]
Assets serviced	$ 189.8	$ 170.3
Percent of aggregate unpaid principal balance	5.40%	6.50%
Financial Asset, 30 to 59 Days Past Due [Member]
Participating Mortgage Loans [Line Items]
Percent of aggregate unpaid principal balance	2.80%	3.10%
Financial Asset, 60 to 89 Days Past Due [Member]
Participating Mortgage Loans [Line Items]
Percent of aggregate unpaid principal balance	0.90%	1.10%
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Participating Mortgage Loans [Line Items]
Percent of aggregate unpaid principal balance	1.70%	2.30%
Fair Value Non-Agency Mortgage Servicing Rights
Participating Mortgage Loans [Line Items]
Assets serviced	$ 20.0	$ 21.6
Percent of aggregate unpaid principal balance	17.30%	18.70%
Fair Value Non-Agency Mortgage Servicing Rights | Financial Asset, 30 to 59 Days Past Due [Member]
Participating Mortgage Loans [Line Items]
Percent of aggregate unpaid principal balance	8.50%	8.40%
Fair Value Non-Agency Mortgage Servicing Rights | Financial Asset, 60 to 89 Days Past Due [Member]
Participating Mortgage Loans [Line Items]
Percent of aggregate unpaid principal balance	2.90%	3.40%
Fair Value Non-Agency Mortgage Servicing Rights | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Participating Mortgage Loans [Line Items]
Percent of aggregate unpaid principal balance	5.90%	6.90%
Fair Value GSE Mortgage Servicing Rights
Participating Mortgage Loans [Line Items]
Assets serviced	$ 145.0	$ 129.3
Percent of aggregate unpaid principal balance	1.50%	1.80%
Fair Value GSE Mortgage Servicing Rights | Financial Asset, 30 to 59 Days Past Due [Member]
Participating Mortgage Loans [Line Items]
Percent of aggregate unpaid principal balance	0.90%	1.00%
Fair Value GSE Mortgage Servicing Rights | Financial Asset, 60 to 89 Days Past Due [Member]
Participating Mortgage Loans [Line Items]
Percent of aggregate unpaid principal balance	0.20%	0.20%
Fair Value GSE Mortgage Servicing Rights | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Participating Mortgage Loans [Line Items]
Percent of aggregate unpaid principal balance	0.40%	0.50%
Fair Value GNMA Mortgage Servicing Rights
Participating Mortgage Loans [Line Items]
Assets serviced	$ 24.8	$ 19.4
Percent of aggregate unpaid principal balance	9.10%	11.80%
Fair Value GNMA Mortgage Servicing Rights | Financial Asset, 30 to 59 Days Past Due [Member]
Participating Mortgage Loans [Line Items]
Percent of aggregate unpaid principal balance	4.70%	5.40%
Fair Value GNMA Mortgage Servicing Rights | Financial Asset, 60 to 89 Days Past Due [Member]
Participating Mortgage Loans [Line Items]
Percent of aggregate unpaid principal balance	1.50%	1.80%
Fair Value GNMA Mortgage Servicing Rights | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Participating Mortgage Loans [Line Items]
Percent of aggregate unpaid principal balance	2.90%	4.50%

X

- Definition

Total of property assets serviced as measured by UPB.

+ References

No definition available.

+ Details

Name:	onit_AssetsServiced
Namespace Prefix:	onit_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Percentage of financing receivable balance that is past due.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-5

+ Details

Name:	us-gaap_FinancingReceivablePercentPastDue1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ParticipatingMortgageLoansLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables60To89DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=onit_FairValueNonAgencyMortgageServicingRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=onit_FairValueGSEMortgageServicingRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=onit_FairValueGNMAMortgageServicingRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: