XML 86 R61.htm IDEA: XBRL DOCUMENT
v3.20.2

Indebtedness - Schedule of Notes Maturity (Details) - Unsecured senior notes - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
2020 through 2024 | $ 0 |
Thereafter | 2,200 |
Total unsecured senior notes principal amount | $ 2,200 | $ 2,398

X
- Definition Long-Term Debt, Maturity, after Year Four + References No definition available. + Details
Name: | nsm_LongTermDebtMaturityAfterYearFour
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Long-Term Debt, Maturity, Years One Through Four + References No definition available. + Details
Name: | nsm_LongTermDebtMaturityYearsOneThroughFour
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Unsecured Debt, Gross + References No definition available. + Details
Name: | nsm_UnsecuredDebtGross
Namespace Prefix: | nsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |