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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [1] | $ 5,636 | $ 6,908 | $ 7,983
Corporate, Non-Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [1],[2] | (315) | (373) | (407)
Gross Commission Income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [3] | 4,570 | 5,538 | 6,118
Gross Commission Income | Corporate, Non-Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [3] | 0 | 0 | 0
Service revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [4] | 569 | 793 | 1,180
Service revenue | Corporate, Non-Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [4] | 0 | 0 | 0
Franchise fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [5] | 351 | 417 | 521
Franchise fees | Corporate, Non-Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [5] | (301) | (358) | (393)
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [6] | 146 | 160 | 164
Other | Corporate, Non-Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [6] | (14) | (15) | (14)
Franchise Group | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [1] | 983 | 1,145 | 1,249
Franchise Group | Gross Commission Income | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [3] | 0 | 0 | 0
Franchise Group | Service revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [4] | 223 | 260 | 227
Franchise Group | Franchise fees | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [5] | 652 | 775 | 914
Franchise Group | Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [6] | 108 | 110 | 108
Owned Brokerage Group | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [1] | 4,628 | 5,606 | 6,189
Owned Brokerage Group | Gross Commission Income | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [3] | 4,570 | 5,538 | 6,118
Owned Brokerage Group | Service revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [4] | 21 | 22 | 29
Owned Brokerage Group | Franchise fees | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [5] | 0 | 0 | 0
Owned Brokerage Group | Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [6] | 37 | 46 | 42
Title Group | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [1] | 340 | 530 | 952
Title Group | Gross Commission Income | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [3] | 0 | 0 | 0
Title Group | Service revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [4] | 325 | 511 | 924
Title Group | Franchise fees | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [5] | 0 | 0 | 0
Title Group | Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [6] | $ 15 | $ 19 | $ 28
[1] | Transactions between segments are eliminated in consolidation. Revenues for Franchise Group include intercompany royalties and marketing fees paid by Owned Brokerage Group of $315 million, $373 million and $407 million for the years ended December 31, 2023, 2022 and 2021, respectively. Such amounts are eliminated through the Corporate and Other line.
[2] | Includes the elimination of transactions between segments.
[3] | Gross commission income at Owned Brokerage Group is recognized at a point in time at the closing of a homesale transaction.
[4] | Service revenue primarily consists of title and escrow fees at Title Group and are recognized at a point in time at the closing of a homesale transaction. Service revenue at 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.
[5] | Franchise fees at 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).
[6] | Other revenue is comprised of brand marketing funds received from franchisees at Franchise Group and other miscellaneous revenues across all of the business segments.

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