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v3.20.2

Payables and Other Liabilities - Additional Information (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Business Acquisition [Line Items] |  |
Loans subject to repurchase right from Ginnie Mae | $ 1,171 | $ 560
Financial Asset, Equal to or Greater than 90 Days Past Due | Payment Deferral |  |
Business Acquisition [Line Items] |  |
Loans subject to repurchase right from Ginnie Mae | $ 818 |

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- Definition Resell Agreement, Loans and Leases Receivable + References No definition available. + Details
Name: | nsm_ResellAgreementLoansAndLeasesReceivable
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | us-gaap_LoanRestructuringModificationAxis=us-gaap_PaymentDeferralMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |