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Note 2. Summary of Significant Accounting Policies Supplemental Cash Flow Information (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Capital Lease Obligations Incurred $ 8us-gaap_CapitalLeaseObligationsIncurred $ 14us-gaap_CapitalLeaseObligationsIncurred $ 6us-gaap_CapitalLeaseObligationsIncurred
Stock Issued   22us-gaap_StockIssued1  
Noncash tenant improvements   6rlgy_Noncashtenantimprovements 21rlgy_Noncashtenantimprovements
2012 Bonus Plan [Member]      
Stock Issued     12us-gaap_StockIssued1
/ us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis
= rlgy_A2012BonusPlanMember
Convertible Debt [Member]      
Stock Issued     $ 2,366us-gaap_StockIssued1
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= us-gaap_ConvertibleDebtMember