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Reverse Mortgage Interests - Purchase Discount Rollforward (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Purchase discount, net, for reverse mortgage interests |  |
Balance - beginning of year | $ (114) | $ (164)
Amortization, net of accretion | (44) | (22)
Utilization of purchase discounts | 31 | 96
Adjustments | 0 | (24)
Balance - end of year | $ (127) | $ (114)

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- Definition Reverse Mortgage Interest, Unpaid Principal Balance, Purchase Discount, Adjustments + References No definition available. + Details
Name: | coop_ReverseMortgageInterestUnpaidPrincipalBalancePurchaseDiscountAdjustments
Namespace Prefix: | coop_
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: | coop_ReverseMortgageInterestUnpaidPrincipalBalancePurchaseDiscountNet
Namespace Prefix: | coop_
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: | coop_ReverseMortgageInterestUnpaidPrincipalBalancePurchaseDiscountNetAccretion
Namespace Prefix: | coop_
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: | coop_ReverseMortgageInterestUnpaidPrincipalBalancePurchaseDiscountNetUtilization
Namespace Prefix: | coop_
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: | coop_UnsecuritizedInterestsRollforwardRollForward
Namespace Prefix: | coop_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration