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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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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
Disaggregation of Revenue [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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  | 298 |  | 314 |  | 227 |  | 220 |  | 269 |  | 319 |  | 331 |  | 239 |  | 1,059 | [1] | 1,158 | [1] | 1,198 | [1]
Realogy Brokerage Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  | 226 |  | 213 |  | 160 |  | 137 |  | 152 |  | 170 |  | 160 |  | 114 |  | 736 | [1] | 596 | [1] | 580 | [1]
Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [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]
Gross Commission Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [5] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,669 |  | 4,330 |  | 4,533 |
Gross Commission Income | Realogy Franchise Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [5] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Gross Commission Income | Realogy Brokerage Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [5] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,669 |  | 4,330 |  | 4,533 |
Gross Commission Income | Realogy Title Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [5] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Gross Commission Income | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [5] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Service revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [6] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 983 |  | 941 |  | 947 |
Service revenue | Realogy Franchise Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [6] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 243 |  | 351 |  | 374 |
Service revenue | Realogy Brokerage Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [6] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26 |  | 11 |  | 9 |
Service revenue | Realogy Title Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [6] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 714 |  | 579 |  | 564 |
Service revenue | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [6] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Franchise fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [7] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 419 |  | 386 |  | 393 |
Franchise fees | Realogy Franchise Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [7] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 725 |  | 668 |  | 688 |
Franchise fees | Realogy Brokerage Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [7] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Franchise fees | Realogy Title Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [7] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Franchise fees | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [7] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (306) |  | (282) |  | (295) |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [8] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150 |  | 213 |  | 206 |
Other | Realogy Franchise Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [8] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 91 |  | 139 |  | 136 |
Other | Realogy Brokerage Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [8] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47 |  | 68 |  | 65 |
Other | Realogy Title Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [8] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22 |  | 17 |  | 16 |
Other | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [8] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (10) |  | $ (11) |  | $ (11) |
[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.
[5] | Gross commission income at Realogy Brokerage Group is recognized at a point in time at the closing of a homesale transaction.
[6] | Service revenue primarily consist of title and escrow fees at Realogy Title Group and are recognized at a point in time at the closing of a homesale transaction. Service revenue at Realogy Franchise Group includes relocation fees, which are recognized as revenue when or as the related performance obligation is satisfied dependent on the type of service performed, and fees related to leads and related services, which are recognized at a point in time at the closing of a homesale transaction or at the completion of the related service.
[7] | Franchise fees at Realogy Franchise Group primarily include domestic royalties which are recognized at a point in time when the underlying franchisee revenue is earned (upon close of the homesale transaction).
[8] | Other revenue includes brand marketing funds received at Realogy Franchise Group from franchisees, third-party listing fees in 2019 and 2018, and other miscellaneous revenues across all of the business segments.

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