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Payables and Accrued Liabilities - Repurchase Reserves (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
Loans Subject to Repurchase Reserve [Roll Forward] |  |  |  |  |
Balance - beginning of period |  | $ 9 |  |  |
Provisions |  | 1 |  |  |
Releases |  | (1) |  |  |
Charge-offs |  | 0 |  |  |
Balance - end of period | $ 9 | 9 |  | $ 9 |
Predecessor |  |  |  |  |
Loans Subject to Repurchase Reserve [Roll Forward] |  |  |  |  |
Balance - beginning of period | 9 | $ 9 | $ 14 | 9 | $ 18
Provisions | 0 |  | 2 | 3 | 5
Releases | 0 |  | 0 | (3) | (6)
Charge-offs | 0 |  | (1) | 0 | (2)
Balance - end of period | $ 9 |  | $ 15 | $ 9 | $ 15

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- Definition Loans Subject to Repurchase Reserve [Roll Forward] + References No definition available. + Details
Name: | coop_LoansSubjectToRepurchaseReserveRollForward
Namespace Prefix: | coop_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Repurchase Reserve + References No definition available. + Details
Name: | coop_RepurchaseReserve
Namespace Prefix: | coop_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Repurchase Reserve, Additions + References No definition available. + Details
Name: | coop_RepurchaseReserveAdditions
Namespace Prefix: | coop_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Repurchase Reserve, Charge-offs + References No definition available. + Details
Name: | coop_RepurchaseReserveChargeoffs
Namespace Prefix: | coop_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Repurchase Reserve, Reductions + References No definition available. + Details
Name: | coop_RepurchaseReserveReductions
Namespace Prefix: | coop_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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