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v3.19.1

Payables and Other Liabilities - Repurchase Reserves (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Loans Subject to Repurchase Reserve [Roll Forward] |  |
Balance - beginning of period | $ 8 |
Provisions | 8 |
Releases | 0 |
Charge-offs | 0 |
Balance - end of period | $ 16 |
Predecessor |  |
Loans Subject to Repurchase Reserve [Roll Forward] |  |
Balance - beginning of period |  | $ 9
Provisions |  | 1
Releases |  | (1)
Charge-offs |  | 0
Balance - end of period |  | $ 9

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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: |