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Revenue Recognition Revenue Recognition - Deferred Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Jan. 01, 2018
Deferred Revenue Arrangement [Line Items]    
Deferred Revenue $ 109 $ 114
Additions during the period 52  
Deferred Revenue, Revenue Recognized (57)  
Movement in Deferred Revenue [Roll Forward]    
Additions during the period 52  
Recognized as Revenue during the period (57)  
Ending Balance at March 31, 2018 109  
Real Estate Franchise Services    
Deferred Revenue Arrangement [Line Items]    
Deferred Revenue [1] 75 79
Additions during the period [1] 30  
Deferred Revenue, Revenue Recognized [1] (34)  
Movement in Deferred Revenue [Roll Forward]    
Additions during the period [1] 30  
Recognized as Revenue during the period [1] (34)  
Ending Balance at March 31, 2018 [1] 75  
Real Estate Franchise Services | Brand Marketing Fees    
Deferred Revenue Arrangement [Line Items]    
Deferred Revenue 9 13
Movement in Deferred Revenue [Roll Forward]    
Ending Balance at March 31, 2018 9  
Real Estate Franchise Services | Area Development Fees    
Deferred Revenue Arrangement [Line Items]    
Deferred Revenue 57 58
Additions during the period [1] 0  
Movement in Deferred Revenue [Roll Forward]    
Additions during the period [1] 0  
Ending Balance at March 31, 2018 57  
Real Estate Franchise Services | Various Other Revenue Contracts    
Deferred Revenue Arrangement [Line Items]    
Deferred Revenue 9 8
Movement in Deferred Revenue [Roll Forward]    
Ending Balance at March 31, 2018 9  
Company Owned Real Estate Brokerage Services    
Deferred Revenue Arrangement [Line Items]    
Deferred Revenue 16 17
Additions during the period 3  
Deferred Revenue, Revenue Recognized (4)  
Movement in Deferred Revenue [Roll Forward]    
Additions during the period 3  
Recognized as Revenue during the period (4)  
Ending Balance at March 31, 2018 16  
Company Owned Real Estate Brokerage Services | New Development Business    
Deferred Revenue Arrangement [Line Items]    
Deferred Revenue 10 10
Additions during the period 2  
Deferred Revenue, Revenue Recognized (2)  
Movement in Deferred Revenue [Roll Forward]    
Additions during the period 2  
Recognized as Revenue during the period (2)  
Ending Balance at March 31, 2018 10  
Relocation Services    
Deferred Revenue Arrangement [Line Items]    
Deferred Revenue 18 18
Additions during the period 19  
Deferred Revenue, Revenue Recognized (19)  
Movement in Deferred Revenue [Roll Forward]    
Additions during the period 19  
Recognized as Revenue during the period (19)  
Ending Balance at March 31, 2018 18  
Relocation Services | Outsourcing Management Fees    
Deferred Revenue Arrangement [Line Items]    
Deferred Revenue 6 5
Additions during the period 13  
Deferred Revenue, Revenue Recognized (12)  
Movement in Deferred Revenue [Roll Forward]    
Additions during the period 13  
Recognized as Revenue during the period (12)  
Ending Balance at March 31, 2018 6  
Relocation Services | Broker Network Fees    
Deferred Revenue Arrangement [Line Items]    
Deferred Revenue 6 $ 8
Deferred Revenue, Revenue Recognized (3)  
Movement in Deferred Revenue [Roll Forward]    
Recognized as Revenue during the period (3)  
Ending Balance at March 31, 2018 $ 6  
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  
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  
[1] (a)Revenues recognized include intercompany marketing fees paid by the Company Owned Real Estate Brokerage Services segment.