XML 71 R57.htm IDEA: XBRL DOCUMENT
v3.21.1

Derivative Financial Instruments - Narrative (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Other assets |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Collateral deposit assets (liabilities) | $ 2 | $ 61
Payables and other liabilities |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Collateral deposit assets (liabilities) | $ (113) |

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

X
- 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_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_AccountsPayableAndAccruedLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |