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Subsequent Events (Details) - Subsequent Event	Oct. 06, 2021 USD ($)
Subsequent Event [Line Items]
Liquidation preference rights amount under the strategic agreement with Centerbridge	$ 210
Joint venture with Centerbridge
Subsequent Event [Line Items]
Equity Method Investment, Unowned Percentage	70.00%
Equity Method Investment, Ownership Percentage	30.00%

X

- Definition

The percentage of ownership of common stock or equity participation by another party in an investee accounted for under the equity method of accounting.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Liquidation preference rights amount under the strategic agreement with Centerbridge, subject to closing adjustments.

+ References

No definition available.

+ Details

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

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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- Details

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X

- Details

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