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Segment Information - Revenues (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues [1] $ 2,276 $ 1,255 $ 3,823 $ 2,423
Realogy Franchise Group        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues [1] 347 227 601 447
Realogy Franchise Group | Royalties and Marketing Fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues 117 65 196 123
Realogy Brokerage Group        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues [1] 1,791 933 2,962 1,802
Realogy Title Group        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues [1] 255 160 456 297
Corporate and Other        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues [1],[2] $ (117) $ (65) $ (196) $ (123)
[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 $117 million and $196 million for the three and six months ended June 30, 2021, respectively, and $65 million and $123 million for the three and six months ended June 30, 2020, respectively. Such amounts are eliminated through the Corporate and Other line.
[2] Includes the elimination of transactions between segments.