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Reverse Mortgage Interests - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest income on reverse mortgages | $ 40 | $ 62
Participating Interests in HMBS |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
UPB securitized | 33 | 52
Reverse mortgage interests, unsecuritized | HECM |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Repurchase of HECM loans | 216 | 383
Repurchase of HECM loans funded by prior servicer | 66 | 103
Housing and urban development, home equity conversion mortgage loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unsecuritized interests | $ 137 | $ 266

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- Definition Interest Income, Reverse Mortgages + References No definition available. + Details
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Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Reverse Mortgage Interest, Unpaid Principal Balance Assigned, Unsecuritized + References No definition available. + Details
Name: | nsm_ReverseMortgageInterestUnpaidPrincipalBalanceAssignedUnsecuritized
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Reverse Mortgage Interest, Unpaid Principal Balance, Securitized + References No definition available. + Details
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Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Reverse Mortgage Interest, Unsecuritized, Repurchase of Home Equity Conversion Mortgages + References No definition available. + Details
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Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Reverse Mortgage Interest, Unsecuritized, Repurchase of Home Equity Conversion Mortgages Funded by Prior Servicer + References No definition available. + Details
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Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=nsm_ReverseMortgageInterestsUnsecuritizedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=nsm_HECMMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |