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Segment Information - Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Net revenues | [1],[2] | $ 1,820 | $ 1,793 | [3] | $ 3,049 | $ 2,996 | [3]
Real Estate Franchise Services |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Net revenues | [1],[2] | 237 | 237 | [3] | 413 | 407 | [3]
Real Estate Franchise Services | Royalties and Marketing Fees |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Net revenues |  | 92 | 95 |  | 155 | 156 |
Company Owned Real Estate Brokerage Services |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Net revenues | [1],[2] | 1,408 | 1,392 | [3] | 2,325 | 2,289 | [3]
Relocation Services |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Net revenues | [1],[2] | 105 | 102 | [3] | 184 | 179 | [3]
Relocation Services | Referral and Relocation Fees |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Net revenues |  | 12 | 12 |  | 20 | 20 |
Title and Settlement Services |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Net revenues | [1],[2] | 162 | 157 | [3] | 282 | 277 | [3]
Corporate and Other |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Net revenues | [1],[2],[4] | $ (92) | $ (95) | [3] | $ (155) | $ (156) | [3]
[1] | Revenues for the Relocation Services segment include intercompany referral commissions paid by the Company Owned Real Estate Brokerage Services segment of $12 million and $20 million for both the three and six months ended June 30, 2018 and 2017. Such amounts are recorded as contra-revenues by the Company Owned Real Estate Brokerage Services segment. There are no other material intersegment transactions.
[2] | Transactions between segments are eliminated in consolidation. Revenues for the Real Estate Franchise Services segment include intercompany royalties and marketing fees paid by the Company Owned Real Estate Brokerage Services segment of $92 million and $155 million for the three and six months ended June 30, 2018, respectively, and $95 million and $156 million for the three and six months ended June 30, 2017, respectively. Such amounts are eliminated through the Corporate and Other line.
[3] | Prior period amounts have not been adjusted under the modified retrospective method.
[4] | 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. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 + Details
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