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v3.20.2

Payables and Other Liabilities - Repurchase Reserves (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Loans Subject to Repurchase Reserve [Roll Forward] |  |  |  |
Balance - beginning of period | $ 29 | $ 16 | $ 25 | $ 8
Provisions | 4 | 8 | 9 | 16
Releases | (4) | (1) | (5) | (1)
Balance - end of period | $ 29 | $ 23 | $ 29 | $ 23

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