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Reverse Mortgage Interests, Net - Unsecurtized Interests (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Jul. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Reverse Mortgage Interest [Line Items] |  |  |
Repurchased HECM loans (exceed 98% MCA) | $ 949 |  |
HECM related receivables | 300 |  |
Funded borrower draws not yet securitized | 76 |  |
REO-related receivables | 16 |  |
Purchase discount | (122) | $ (173) |
Total unsecuritized interests | $ 1,219 |  |
Predecessor |  |  |
Reverse Mortgage Interest [Line Items] |  |  |
Repurchased HECM loans (exceed 98% MCA) |  |  | $ 1,751
HECM related receivables |  |  | 311
Funded borrower draws not yet securitized |  |  | 82
REO-related receivables |  |  | 25
Purchase discount |  |  | (89)
Total unsecuritized interests |  |  | $ 2,080

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- Definition [Line Items] for Reverse Mortgage Interest [Table] + References No definition available. + Details
Name: | nsm_ReverseMortgageInterestLineItems
Namespace Prefix: | nsm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized + References No definition available. + Details
Name: | nsm_ReverseMortgageInterestUnpaidPrincipalBalanceUnsecuritized
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Funded Draws Not Yet Securitized + References No definition available. + Details
Name: | nsm_ReverseMortgageInterestUnpaidPrincipalBalanceUnsecuritizedFundedDrawsNotYetSecuritized
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Home Equity Conversion Mortgage Receivables + References No definition available. + Details
Name: | nsm_ReverseMortgageInterestUnpaidPrincipalBalanceUnsecuritizedHomeEquityConversionMortgageReceivables
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Purchase Discount + References No definition available. + Details
Name: | nsm_ReverseMortgageInterestUnpaidPrincipalBalanceUnsecuritizedPurchaseDiscount
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Real Estate Owned Related Receivables + References No definition available. + Details
Name: | nsm_ReverseMortgageInterestUnpaidPrincipalBalanceUnsecuritizedRealEstateOwnedRelatedReceivables
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Repurchase of Home Equity Conversion Mortgages + References No definition available. + Details
Name: | nsm_ReverseMortgageInterestUnpaidPrincipalBalanceUnsecuritizedRepurchaseofHomeEquityConversionMortgages
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_PredecessorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |