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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.