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Revenue Recognition Revenue Recognition - Deferred Revenue (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Jan. 01, 2018
Deferred Revenue Arrangement [Line Items]      
Royalty Rate 6.00%    
Deferred Revenue $ 102 $ 102 $ 114
Movement in Deferred Revenue [Roll Forward]      
Additions during the period 166    
Recognized as Revenue during the period (178)    
Ending Balance at September 30, 2018 102    
Real Estate Franchise Services      
Deferred Revenue Arrangement [Line Items]      
Deferred Revenue [1] 74 74 79
Deferred Sales Commission   24 24
Movement in Deferred Revenue [Roll Forward]      
Additions during the period [1] 88    
Recognized as Revenue during the period [1] (93)    
Ending Balance at September 30, 2018 [1] 74    
Real Estate Franchise Services | Brand Marketing Fees      
Deferred Revenue Arrangement [Line Items]      
Deferred Revenue 8 8 13
Movement in Deferred Revenue [Roll Forward]      
Ending Balance at September 30, 2018 8    
Real Estate Franchise Services | Area Development Fees      
Deferred Revenue Arrangement [Line Items]      
Deferred Revenue 55 55 58
Movement in Deferred Revenue [Roll Forward]      
Additions during the period [1] 1    
Recognized as Revenue during the period (4)    
Ending Balance at September 30, 2018 55    
Company Owned Real Estate Brokerage Services      
Deferred Revenue Arrangement [Line Items]      
Deferred Revenue 15 15 17
Movement in Deferred Revenue [Roll Forward]      
Additions during the period 12    
Recognized as Revenue during the period (14)    
Ending Balance at September 30, 2018 15    
Company Owned Real Estate Brokerage Services | New Development Business      
Deferred Revenue Arrangement [Line Items]      
Deferred Revenue 10 10 10
Movement in Deferred Revenue [Roll Forward]      
Additions during the period 5    
Recognized as Revenue during the period (5)    
Ending Balance at September 30, 2018 10    
Relocation Services      
Deferred Revenue Arrangement [Line Items]      
Deferred Revenue 13 13 18
Movement in Deferred Revenue [Roll Forward]      
Additions during the period 66    
Recognized as Revenue during the period (71)    
Ending Balance at September 30, 2018 13    
Relocation Services | Outsourcing Management Fees      
Deferred Revenue Arrangement [Line Items]      
Deferred Revenue 5 5 5
Movement in Deferred Revenue [Roll Forward]      
Additions during the period 48    
Recognized as Revenue during the period (48)    
Ending Balance at September 30, 2018 5    
Relocation Services | Broker Network Fees      
Deferred Revenue Arrangement [Line Items]      
Deferred Revenue 3 $ 3 $ 8
Movement in Deferred Revenue [Roll Forward]      
Additions during the period 2    
Recognized as Revenue during the period (7)    
Ending Balance at September 30, 2018 $ 3    
Minimum | Company Owned Real Estate Brokerage Services      
Deferred Revenue Arrangement [Line Items]      
New Development Period 18 months    
Minimum | Relocation Services      
Deferred Revenue Arrangement [Line Items]      
Average Length of a Move 3 months    
Maximum | Company Owned Real Estate Brokerage Services      
Deferred Revenue Arrangement [Line Items]      
New Development Period 24 months    
Maximum | Relocation Services      
Deferred Revenue Arrangement [Line Items]      
Average Length of a Move 6 months    
Franchise Rights | Real Estate Franchise Services      
Deferred Revenue Arrangement [Line Items]      
Amortization period 30 years    
International Franchise Rights | Real Estate Franchise Services      
Deferred Revenue Arrangement [Line Items]      
Amortization period 25 years    
[1] Revenues recognized include intercompany marketing fees paid by the Company Owned Real Estate Brokerage Services segment.