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v3.19.1

Payables and Accrued Liabilities - Repurchase Reserves (Details) - USD ($) $ in Millions | 5 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Jul. 31, 2018 | Dec. 31, 2017
Loans Subject to Repurchase Reserve [Roll Forward] |  |  |
Repurchase Reserve | $ 9 |  |
Provisions | 3 |  |
Releases | (4) |  |
Charge-offs | 0 |  |
Repurchase Reserve | 8 | $ 9 |
Predecessor |  |  |
Loans Subject to Repurchase Reserve [Roll Forward] |  |  |
Repurchase Reserve | $ 9 | 9 | $ 18
Provisions |  | 3 | 7
Releases |  | (3) | (14)
Charge-offs |  | 0 | (2)
Repurchase Reserve |  | $ 9 | $ 9

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- Definition Loans Subject to Repurchase Reserve [Roll Forward] + References No definition available. + Details
Name: | nsm_LoansSubjectToRepurchaseReserveRollForward
Namespace Prefix: | nsm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Repurchase Reserve + References No definition available. + Details
Name: | nsm_RepurchaseReserve
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Repurchase Reserve, Additions + References No definition available. + Details
Name: | nsm_RepurchaseReserveAdditions
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Repurchase Reserve, Charge-offs + References No definition available. + Details
Name: | nsm_RepurchaseReserveChargeoffs
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Repurchase Reserve, Reductions + References No definition available. + Details
Name: | nsm_RepurchaseReserveReductions
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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