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v3.19.3.a.u2

Short And Long-Term Debt Other Debt Facilities (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
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 |  | $ 66,000,000
Outstanding letter of credit |  | $ 63,000,000

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: |