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Short And Long-Term Debt Other Debt Facilities (Details) $ in Millions | Mar. 31, 2017 USD ($)
--- | ---
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 | 131
Outstanding letters of credit | 126
Unsecured Letter of Credit Facility | September 2018 |
Line of Credit Facility [Line Items] |
Letter of Credit, borrowing capacity | 65
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: |