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Segment Information - Revenues (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues [1] $ 2,186 $ 1,909 $ 6,009 $ 4,332
Realogy Franchise Group        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues [1] 342 314 943 761
Realogy Franchise Group | Royalties and Marketing Fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues 111 97 307 220
Realogy Brokerage Group        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues [1] 1,705 1,479 4,667 3,281
Realogy Title Group        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues [1] 250 213 706 510
Corporate and Other        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues [1],[2] $ (111) $ (97) $ (307) $ (220)
[1] Transactions between segments are eliminated in consolidation. Revenues for the Realogy Franchise Group include intercompany royalties and marketing fees paid by Realogy Brokerage Group of $111 million and $307 million for the three and nine months ended September 30, 2021, respectively, and $97 million and $220 million for the three and nine months ended September 30, 2020, respectively. Such amounts are eliminated through the Corporate and Other line.
[2] Includes the elimination of transactions between segments.