XML 122 R107.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Securitizations and Financings - Securitization Trusts (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Variable Interest Entities and Securitizations [Abstract] |  |
Total collateral balances - UPB | $ 1,503 | $ 1,873
Total certificate balances | 1,512 | 1,817
Unconsolidated securitization trusts | $ 193 | $ 285

X
- Definition Qualitative and Quantitative Information, Transferor's Continuing Involvement, Certificate Balances + References No definition available. + Details
Name: | nsm_QualitativeAndQuantitativeInformationTransferorsContinuingInvolvementCertificateBalances
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Qualitative and Quantitative Information, Transferor's Continuing Involvement, Collateral Balances + References No definition available. + Details
Name: | nsm_QualitativeAndQuantitativeInformationTransferorsContinuingInvolvementCollateralBalances
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Variable Interest Entities and Securitizations + References No definition available. + Details
Name: | nsm_VariableInterestEntitiesAndSecuritizationsAbstract
Namespace Prefix: | nsm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of financing receivable past due. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922355-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919253-210447 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953401-111524 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentPastDue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant