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Leases Lessee Disclosure - Narrative (Details)	Dec. 31, 2019 real_estate_leases
Real estate leases
Lessee, Lease, Description [Line Items]
Number of real estate leases	1,100
Real estate leases | Maximum
Lessee, Lease, Description [Line Items]
Brokerage sales offices	17 years
Real estate leases | Minimum
Lessee, Lease, Description [Line Items]
Brokerage sales offices	1 year
Brokerage sales offices | Maximum
Lessee, Lease, Description [Line Items]
Brokerage sales offices	5 years
Brokerage sales offices | Minimum
Lessee, Lease, Description [Line Items]
Brokerage sales offices	1 year
Short-term lease | Maximum
Lessee, Lease, Description [Line Items]
Brokerage sales offices	12 months

X

- Definition

Number of real estate leases

+ References

No definition available.

+ Details

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Namespace Prefix:	rlgy_
Data Type:	xbrli:integerItemType
Balance Type:	na
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_LesseeLeaseDescriptionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_LeaseArrangementTypeAxis=rlgy_RealestateleasesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LeaseArrangementTypeAxis=rlgy_BrokeragesalesofficesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LeaseArrangementTypeAxis=rlgy_ShorttermleaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: