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Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Net revenues $ 1,889 $ 1,909 $ 1,255 $ 1,168 $ 1,392 $ 1,629 $ 1,735 $ 1,114 $ 6,221 [1] $ 5,870 [1] $ 6,079 [1]
Realogy Franchise Group                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Net revenues 298 314 227 220 269 319 331 239 1,059 [1] 1,158 [1] 1,198 [1]
Realogy Franchise Group | Royalties and Marketing Fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Net revenues                 316 293 306
Realogy Brokerage Group                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Net revenues 1,461 1,479 933 869 1,040 1,222 1,331 816 4,742 [1] 4,409 [1] 4,607 [1]
Realogy Title Group                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Net revenues 226 213 160 137 152 170 160 114 736 [1] 596 [1] 580 [1]
Corporate and Other                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Net revenues $ (96) [2] $ (97) [2] $ (65) [2] $ (58) [2] $ (69) [3] $ (82) [3] $ (87) [3] $ (55) [3] $ (316) [1],[4] $ (293) [1],[4] $ (306) [1],[4]
[1] Transactions between segments are eliminated in consolidation. Revenues for Realogy Franchise Group include intercompany royalties and marketing fees paid by Realogy Brokerage Group of $316 million, $293 million and $306 million for the years ended December 31, 2020, 2019 and 2018, respectively. Such amounts are eliminated through the Corporate and Other line.
[2] Represents the elimination of transactions primarily between Realogy Franchise Group and Realogy Brokerage Group.
[3] Represents the elimination of transactions primarily between Realogy Franchise Group and Realogy Brokerage Group.
[4] Includes the elimination of transactions between segments.