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Short And Long-Term Debt Other Debt Facilities (Details) - USD ($) $ in Millions | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Aug. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014 | Mar. 05, 2013
Line of Credit Facility [Line Items] |  |  |  |
Letter of Credit, borrowing capacity |  |  |  | $ 250
Outstanding letters of credit |  | $ 135 |  |
Unsecured Letter of Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Increase in borrowing capacity | $ 7 |  |  |
Letter of Credit, borrowing capacity |  | 88 | $ 81 |
Outstanding letters of credit |  | 82 |  |
June 2017 [Member] | Unsecured Letter of Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Letter of Credit, borrowing capacity |  | 27 |  |
August 2017 [Member] | Unsecured Letter of Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Letter of Credit, borrowing capacity |  | 54 |  |
September 2018 [Member] | Unsecured Letter of Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Letter of Credit, borrowing capacity |  | $ 7 |  |

X
- Definition Increase in borrowing capacity + References No definition available. + Details
Name: | rlgy_Increaseinborrowingcapacity
Namespace Prefix: | rlgy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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
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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
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
Name: | rlgy_DebtInstrumentMaturitiesAxis=rlgy_June2017Member
Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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