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v3.21.1

Advances and Other Receivables - Purchase Discount (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Servicing Advances |  |
Balance - beginning of period | $ 72 | $ 131
Utilization of purchase discounts | (9) | (6)
Balance - end of period | 63 | 125
Receivables from Agencies, Investors and Prior Servicers |  |
Balance - beginning of period | 20 | 21
Utilization of purchase discounts | (1) | 0
Balance - end of period | $ 21 | $ 21

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- Definition Accretion of Service Advances Discount + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Receivable Discount, Accretion Expense + References No definition available. + Details
Name: | nsm_ReceivableDiscountAccretionExpense
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Receivable Discount [Roll Forward] + References No definition available. + Details
Name: | nsm_ReceivableDiscountRollForward
Namespace Prefix: | nsm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Servicing Advances, Discount + References No definition available. + Details
Name: | nsm_ServicingAdvancesDiscount
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Servicing Advances [Roll Forward] + References No definition available. + Details
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Namespace Prefix: | nsm_
Data Type: | xbrli:stringItemType
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- Definition Disclosure of the unamortized amount of the discount on the note or receivable which is deducted from the face amount of the receivable or loan. The discount or premium is the difference between the present value and the face amount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant