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Reverse Mortgage Interests - Unsecuritized Interest (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Reverse Mortgage Interest [Abstract] |  |
Repurchased HECM loans (exceeds 98% of their Max Claim Amount (“MCA”)) | $ 699 | $ 665
HECM related receivables | 180 | 208
Funded borrower draws not yet securitized | 77 | 72
Real estate owned (“REO”) related receivables | 16 | 19
Total unsecuritized interests | $ 972 | $ 964

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- Definition Reverse Mortgage Interest [Abstract] + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized + References No definition available. + Details
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Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Funded Draws Not Yet Securitized + References No definition available. + Details
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- Definition Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Home Equity Conversion Mortgage Receivables + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Real Estate Owned Related Receivables + References No definition available. + Details
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- Definition Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Repurchase of Home Equity Conversion Mortgages + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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