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Basis Of Presentation Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [1] | $ 1,547 | $ 1,168
Gross commission income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [2] | 1,154 | 850
Service revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [3] | 249 | 202
Franchise fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [4] | 105 | 71
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [5] | 39 | 45
Realogy Franchise Group |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [1] | 254 | 220
Realogy Franchise Group | Gross commission income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [2] | 0 | 0
Realogy Franchise Group | Service revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [3] | 47 | 64
Realogy Franchise Group | Franchise fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [4] | 181 | 127
Realogy Franchise Group | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [5] | 26 | 29
Realogy Brokerage Group |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [1] | 1,171 | 869
Realogy Brokerage Group | Gross commission income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [2] | 1,154 | 850
Realogy Brokerage Group | Service revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [3] | 7 | 5
Realogy Brokerage Group | Franchise fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [4] | 0 | 0
Realogy Brokerage Group | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [5] | 10 | 14
Realogy Title Group |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [1] | 201 | 137
Realogy Title Group | Gross commission income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [2] | 0 | 0
Realogy Title Group | Service revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [3] | 195 | 133
Realogy Title Group | Franchise fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [4] | 0 | 0
Realogy Title Group | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [5] | 6 | 4
Corporate and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [1],[6] | (79) | (58)
Corporate and Other | Gross commission income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [2] | 0 | 0
Corporate and Other | Service revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [3] | 0 | 0
Corporate and Other | Franchise fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [4] | (76) | (56)
Corporate and Other | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [5] | $ (3) | $ (2)
[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 $79 million and $58 million for the three months ended March 31, 2021 and 2020, respectively. Such amounts are eliminated through the Corporate and Other line.
[2] | Gross commission income at Realogy Brokerage Group is recognized at a point in time at the closing of a homesale transaction
[3] | Service revenue primarily consists 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.
[4] | 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).
[5] | Other revenue is comprised of brand marketing funds received from franchisees at Realogy Franchise Group and other miscellaneous revenues across all of the business segments.
[6] | Includes the elimination of transactions between segments.

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. 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