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Loans Subject to Repurchase from Ginnie Mae (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Receivables [Abstract] |  |
Loans subject to repurchase from Ginnie Mae | $ 966 | $ 1,865

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- Definition Resell Agreement, Loans and Leases Receivable + References No definition available. + Details
Name: | coop_ResellAgreementLoansAndLeasesReceivable
Namespace Prefix: | coop_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration