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Reverse Mortgage Interests, Net - Reverse Mortgage Interests Roll Forward (Details) - USD ($) $ in Millions | 5 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Jul. 31, 2018 | Dec. 31, 2017
Reverse Mortgage Interests Reserves [Roll Forward] |  |  |
Balance - beginning of period | $ 0 |  |
Provision | 13 |  |
Write-offs | 0 |  |
Balance - end of period | 13 | $ 0 |
Predecessor |  |  |
Reverse Mortgage Interests Reserves [Roll Forward] |  |  |
Balance - beginning of period | $ 129 | 115 | $ 131
Provision |  | 32 | 76
Write-offs |  | (18) | (92)
Balance - end of period |  | $ 129 | $ 115

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- Definition Reverse Funded Loan Advances, Reserves + References No definition available. + Details
Name: | nsm_ReverseFundedLoanAdvancesReserves
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Reverse Mortgage Interests Reserves [Roll Forward] + References No definition available. + Details
Name: | nsm_ReverseMortgageInterestsReservesRollForward
Namespace Prefix: | nsm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Reverse Mortgage Reserves, Period Decrease Related to Charge Offs + References No definition available. + Details
Name: | nsm_ReverseMortgageReservesPeriodDecreaseRelatedtoChargeOffs
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Reverse Mortgage Reserves, Period Increase Through Provision for Loan Loss Adjustments + References No definition available. + Details
Name: | nsm_ReverseMortgageReservesPeriodIncreaseThroughProvisionforLoanLossAdjustments
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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