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Note 12. Stock-Based Compensation Phantom Value Plan and Bonus Plan (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Oct. 31, 2012
Jan. 05, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Original amount of Convertible Notes converted into common stock $ 2,110us-gaap_DebtConversionOriginalDebtAmount1          
Stock-based compensation expense   41us-gaap_AllocatedShareBasedCompensationExpense 19us-gaap_AllocatedShareBasedCompensationExpense 5us-gaap_AllocatedShareBasedCompensationExpense    
RCIV [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Original amount of Convertible Notes converted into common stock         1,338us-gaap_DebtConversionOriginalDebtAmount1
/ rlgy_NoteholdersAxis
= rlgy_RcivMember
 
Phantom Plan Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate amount of initial grants of incentive awards granted to executives under the Phantom Value Plan           22rlgy_AggregateamountofinitialgrantsofincentiveawardsgrantedtoexecutivesunderthePhantomValuePlan
/ us-gaap_AwardTypeAxis
= rlgy_PhantomPlanIncentiveAwardsMember
Phantom Value Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percent of additional awards received if executive elects to receive shares in lieu of cash under the Phantom Value Plan           15.00%rlgy_PercentofadditionalawardsreceivedifexecutiveelectstoreceivesharesinlieuofcashunderthePhantomValuePlan
/ us-gaap_PlanNameAxis
= rlgy_PhantomValuePlanMember
Stock-based compensation expense   2us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= rlgy_PhantomValuePlanMember
47us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= rlgy_PhantomValuePlanMember
     
Phantom Value Plan [Member] | Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense     42us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_PlanNameAxis
= rlgy_PhantomValuePlanMember
     
Phantom Value Plan [Member] | Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense   $ 2us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= rlgy_PhantomValuePlanMember
$ 5us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= rlgy_PhantomValuePlanMember