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Reverse Mortgage Interests, Net - Roll Forward (Details) - USD ($) $ in Millions | 5 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Jul. 31, 2018 | Dec. 31, 2019
Reverse Mortgage Interests Reserves [Roll Forward] |  |  |
Balance - beginning of period |  |  | $ 13
Balance - end of period | $ 13 |  | 3
WMIH Corp |  |  |
Reverse Mortgage Interests Reserves [Roll Forward] |  |  |
Balance - beginning of period | 0 |  | 13
Provision | 13 |  | (3)
Write-offs | 0 |  | (7)
Balance - end of period | 13 | $ 0 | $ 3
Nationstar Mortgage Holdings Inc. |  |  |
Reverse Mortgage Interests Reserves [Roll Forward] |  |  |
Balance - beginning of period | $ 129 | 115 |
Provision |  | 32 |
Write-offs |  | (18) |
Balance - end of period |  | $ 129 |

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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: | dei_LegalEntityAxis=nsm_WMIHCorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=nsm_NationstarMortgageHoldingsInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |