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Reverse Mortgage Interests, Net - Reserves Roll Forward (Details) - USD ($) $ in Millions | 1 Months Ended | 2 Months Ended | 3 Months Ended | 7 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Jul. 31, 2018 | Sep. 30, 2017
Reverse Mortgage Interests Reserves [Roll Forward] |  |  |  |  |
Balance - beginning of period |  | $ 0 |  |  |
Provision, net |  | 1 |  |  |
Write-offs |  | 0 |  |  |
Balance - end of period | $ 0 | 1 |  | $ 0 |
Predecessor |  |  |  |  |
Reverse Mortgage Interests Reserves [Roll Forward] |  |  |  |  |
Balance - beginning of period | 117 | $ 129 | $ 149 | 115 | $ 131
Provision, net | 12 |  | 22 | 32 | 44
Write-offs | 0 |  | 83 | 18 | 87
Balance - end of period | $ 129 |  | $ 88 | $ 129 | $ 88

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- Definition Reverse Funded Loan Advances, Reserves + References No definition available. + Details
Name: | coop_ReverseFundedLoanAdvancesReserves
Namespace Prefix: | coop_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Reverse Mortgage Interests Reserves [Roll Forward] + References No definition available. + Details
Name: | coop_ReverseMortgageInterestsReservesRollForward
Namespace Prefix: | coop_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Reverse Mortgage Reserves, Period Decrease Related to Charge Offs + References No definition available. + Details
Name: | coop_ReverseMortgageReservesPeriodDecreaseRelatedtoChargeOffs
Namespace Prefix: | coop_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Reverse Mortgage Reserves, Period Increase Through Provision for Loan Loss Adjustments + References No definition available. + Details
Name: | coop_ReverseMortgageReservesPeriodIncreaseThroughProvisionforLoanLossAdjustments
Namespace Prefix: | coop_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_PredecessorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |