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Reverse Mortgage Interests, Net - Purchase Discount Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Purchase discount, net, for reverse mortgage interests |  |  |  |
Balance - beginning of period | $ (127) | $ (163) | $ (114) | $ (164)
Adjustments | 0 | 0 | 0 | (24)
Utilization of purchase discounts | 8 | 40 | 27 | 80
Amortization, net of accretion | (6) | (1) | (38) | (16)
Balance - end of period | $ (125) | $ (124) | $ (125) | $ (124)

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- Definition Reverse Mortgage Interest, Unpaid Principal Balance, Purchase Discount, Adjustments + References No definition available. + Details
Name: | nsm_ReverseMortgageInterestUnpaidPrincipalBalancePurchaseDiscountAdjustments
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Reverse Mortgage Interest, Unpaid Principal Balance, Purchase Discount, Net + References No definition available. + Details
Name: | nsm_ReverseMortgageInterestUnpaidPrincipalBalancePurchaseDiscountNet
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Reverse Mortgage Interest, Unpaid Principal Balance, Purchase Discount, Net, Utilization + References No definition available. + Details
Name: | nsm_ReverseMortgageInterestUnpaidPrincipalBalancePurchaseDiscountNetUtilization
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Unsecuritized Interests Rollforward [Roll Forward] + References No definition available. + Details
Name: | nsm_UnsecuritizedInterestsRollforwardRollForward
Namespace Prefix: | nsm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration