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Mortgage Loans Held for Sale and Investment - Accretable Yield (Details) - Mortgage Loans Held for Investment $ in Millions | Dec. 31, 2018 USD ($)
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Accounts, Notes, Loans and Financing Receivable [Line Items] |
Non-accrual, UPB | $ 27
Non-accrual, Fair Value | $ 13

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- Definition Mortgage Loans Held For Investment, Nonaccrual Basis, Fair Value + References No definition available. + Details
Name: | nsm_MortgageLoansHeldForInvestmentNonaccrualBasisFairValue
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Mortgage Loans Held For Investment, Nonaccrual Basis, Unpaid Principal Balance + References No definition available. + Details
Name: | nsm_MortgageLoansHeldForInvestmentNonaccrualBasisUnpaidPrincipalBalance
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_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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