XML 53 R39.htm IDEA: XBRL DOCUMENT
v3.21.2

Mortgage Servicing Rights and Related Liabilities - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | --- | ---
Servicing Asset at Amortized Cost [Line Items] |  |  |
Excess spread financing - fair value | $ 822 | $ 934 |
Mortgage servicing rights financing - fair value | 20 | $ 33 |
Forward MSRs Sold |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement | 1,226 |  | $ 94
Forward MSRs Sold, Subservicing Retained |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement | $ 1,144 |  | $ 0

X
- Definition Excess Spread Financing, Fair Value Disclosure + References No definition available. + Details
Name: | nsm_ExcessSpreadFinancingFairValueDisclosure
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Mortgage Servicing Rights Liability Resulting from Sale or Securitization of Servicer Advances, Rights not Accounted for as a Sale + References No definition available. + Details
Name: | nsm_MortgageServicingRightsLiabilityResultingfromSaleofServicerAdvancesRightsnotAccountedforasaSale
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This is the sum of principal amount outstanding for both securitized and unsecuritized loans of all types. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + Details
Name: | us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_ServicingAssetsAtAmortizedValueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=nsm_ForwardMSRsSoldMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=nsm_ForwardMSRsSoldSubservicingRetainedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |