XML 92 R75.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Derivative Financial Instruments - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Collateral deposit assets (liabilities) | $ 3 | $ (1)

X
- Definition Margin Deposit Assets (Liabilities) + References No definition available. + Details
Name: | coop_MarginDepositAssetsLiabilities
Namespace Prefix: | coop_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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