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Note 14. Commitments And Contingencies Contingent Liability Letter of Credit (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Line of Credit Facility [Line Items] |  |
Contingent liabilities of former parent, aggregate value | $ 30 |
Synthetic Letter of Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Outstanding letter of credit | $ 53 | $ 53

X
- Definition The standby irrevocable letter of credit utilized to support the Company’s payment obligations with respect to its share of Cendant contingent and other corporate liabilities will be terminated if the aggregate value of the former parent contingent liabilities falls below this amount. + References No definition available. + Details
Name: | rlgy_MinimumAggregateValueOfFormerParentContingentLiabilitiesForWhichLetterOfCreditWillBeTerminated
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_SyntheticLetterOfCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |