XML 62 R37.htm IDEA: XBRL DOCUMENT
v3.20.2

Mortgage Servicing Rights and Related Liabilities - Narrative (Details) - USD ($) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
Servicing Asset at Amortized Cost [Line Items] |  |  |
Mortgage servicing rights financing - fair value | $ 47,000,000 | $ 37,000,000 |
Forward MSRs Sold |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |
UPB | 94,000,000 |  | $ 25,639,000,000
Forward MSRs Sold, Subservicing Retained |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |
UPB | 0 |  | $ 20,560,000,000
Reverse Mortgage Servicing Rights |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |
Impairment | 0 |  |
HECM |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |
UPB | $ 20,006,000,000 | $ 22,725,000,000 |

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 The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
Name: | us-gaap_ImpairmentOfIntangibleAssetsFinitelived
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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: |

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

X
- Details
Name: | us-gaap_DebtInstrumentAxis=nsm_HECMMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |