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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 5,692 | $ 5,636 | $ 6,908
Segment Reporting, Reconciling Item, Corporate Nonsegment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | (319) | (315) | (373)
Gross Commission Income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [1] | 4,629 | 4,570 | 5,538
Gross Commission Income | Segment Reporting, Reconciling Item, Corporate Nonsegment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [1] | 0 | 0 | 0
Service revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [2] | 574 | 569 | 793
Service revenue | Segment Reporting, Reconciling Item, Corporate Nonsegment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [2] | 0 | 0 | 0
Franchise fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [3] | 356 | 351 | 417
Franchise fees | Segment Reporting, Reconciling Item, Corporate Nonsegment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [3] | (304) | (301) | (358)
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [4] | 133 | 146 | 160
Other | Segment Reporting, Reconciling Item, Corporate Nonsegment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [4] | (15) | (14) | (15)
Franchise Group |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 642 | 668 | 772
Franchise Group | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 961 | 983 | 1,145
Franchise Group | Gross Commission Income | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [1] | 0 | 0 | 0
Franchise Group | Service revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [2] | 204 | 223 | 260
Franchise Group | Franchise fees | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [3] | 660 | 652 | 775
Franchise Group | Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [4] | 97 | 108 | 110
Owned Brokerage Group |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 4,688 | 4,628 | 5,606
Owned Brokerage Group | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 4,688 | 4,628 | 5,606
Owned Brokerage Group | Gross Commission Income | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [1] | 4,629 | 4,570 | 5,538
Owned Brokerage Group | Service revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [2] | 24 | 21 | 22
Owned Brokerage Group | Franchise fees | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [3] | 0 | 0 | 0
Owned Brokerage Group | Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [4] | 35 | 37 | 46
Title Group |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 362 | 340 | 530
Title Group | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 362 | 340 | 530
Title Group | Gross Commission Income | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [1] | 0 | 0 | 0
Title Group | Service revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [2] | 346 | 325 | 511
Title Group | Franchise fees | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [3] | 0 | 0 | 0
Title Group | Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [4] | $ 16 | $ 15 | $ 19
[1] | Gross commission income at Owned Brokerage Group is recognized at a point in time at the closing of a homesale transaction.
[2] | 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.
[3] | 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).
[4] | 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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