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Short And Long-Term Debt Other Debt Facilities (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Line of Credit Facility [Line Items]
Letter of Credit, borrowing capacity	$ 125
Unsecured Letter of Credit Facility
Line of Credit Facility [Line Items]
Letter of Credit, borrowing capacity	74	$ 74
Outstanding letters of credit	65	$ 69
Unsecured Letter of Credit Facility | September 2018
Line of Credit Facility [Line Items]
Letter of Credit, borrowing capacity	8
Unsecured Letter of Credit Facility | December 2019
Line of Credit Facility [Line Items]
Letter of Credit, borrowing capacity	$ 66

X

- Definition

Maximum borrowing capacity under the letter of credit facility.

+ References

No definition available.

+ Details

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

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
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_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_CreditFacilityAxis=rlgy_UnsecuredLetterofCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	rlgy_DebtInstrumentMaturitiesAxis=rlgy_September2018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	rlgy_DebtInstrumentMaturitiesAxis=rlgy_December2019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: