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Intangible Assets - Goodwill (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2018
USD ($)
real_estate_brokerage_operations
Dec. 31, 2017
USD ($)
Goodwill [Line Items]    
Gross goodwill as of December 31, 2017   $ 5,496
Accumulated impairment losses   (1,786)
Balance at December 31, 2017 $ 3,710 3,710
Goodwill [Roll Forward]    
Balance at December 31, 2017 3,710  
Goodwill acquired (a) [1] 1  
Balance at March 31, 2018 $ 3,711  
Company Owned Real Estate Brokerage Services    
Goodwill [Roll Forward]    
Number of Businesses Acquired | real_estate_brokerage_operations 1  
Real Estate Franchise Services    
Goodwill [Line Items]    
Gross goodwill as of December 31, 2017   3,315
Accumulated impairment losses   (1,023)
Balance at December 31, 2017 $ 2,292 2,292
Goodwill [Roll Forward]    
Balance at December 31, 2017 2,292  
Goodwill acquired (a) [1] 0  
Balance at March 31, 2018 2,292  
Company Owned Real Estate Brokerage Services    
Goodwill [Line Items]    
Gross goodwill as of December 31, 2017   1,062
Accumulated impairment losses   (158)
Balance at December 31, 2017 904 904
Goodwill [Roll Forward]    
Balance at December 31, 2017 904  
Goodwill acquired (a) [1] 1  
Balance at March 31, 2018 905  
Relocation Services    
Goodwill [Line Items]    
Gross goodwill as of December 31, 2017   641
Accumulated impairment losses   (281)
Balance at December 31, 2017 360 360
Goodwill [Roll Forward]    
Balance at December 31, 2017 360  
Goodwill acquired (a) [1] 0  
Balance at March 31, 2018 360  
Title and Settlement Services    
Goodwill [Line Items]    
Gross goodwill as of December 31, 2017   478
Accumulated impairment losses   (324)
Balance at December 31, 2017 154 $ 154
Goodwill [Roll Forward]    
Balance at December 31, 2017 154  
Goodwill acquired (a) [1] 0  
Balance at March 31, 2018 $ 154  
[1] Goodwill acquired during the three months ended March 31, 2018 relates to the acquisition of one real estate brokerage operation.