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Loans Subject to Repurchase from Ginnie Mae (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans subject to repurchase | $ 5,395 | $ 560
Financial Asset, Equal to or Greater than 90 Days Past Due | Payment Deferral |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans subject to repurchase | $ 5,095 |

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- Definition Resell Agreement, Loans and Leases Receivable + References No definition available. + Details
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Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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_
Data Type: | xbrli:stringItemType
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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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |