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Short And Long-Term Debt Other Debt Facilities (Details) - USD ($) $ in Millions | Mar. 31, 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 | 66 | $ 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 |

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- 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

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- 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

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- 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

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

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

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