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Payables and Other Liabilities - Additional Information (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Business Acquisition [Line Items] |  |
Loans subject to repurchase from Ginnie Mae | $ 774 | $ 266
Pacific Union |  |
Business Acquisition [Line Items] |  |
Loans subject to repurchase from Ginnie Mae | $ 510 |

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- Definition Amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=coop_PacificUnionFinancialLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |