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Indebtedness - Schedule of Notes Maturity (Details) - Unsecured Senior Notes - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
2021 through 2025	$ 0
Thereafter	2,100
Total unsecured senior notes principal amount	$ 2,100	$ 2,100

X

- Definition

Long-Term Debt, Maturity, after Year Four

+ References

No definition available.

+ Details

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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

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Namespace Prefix:	nsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Unsecured Debt, Gross

+ References

No definition available.

+ Details

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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

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: