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Summary of Significant Accounting Policies (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2008
Dec. 31, 2007
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2019
Dec. 31, 2016
Minimum ownership percentage for consolidation     5000.00%        
Advertising Expense     $ 196,000,000 $ 207,000,000 $ 211,000,000    
Goodwill     3,300,000,000 3,536,000,000 3,534,000,000 $ 3,300,000,000 $ 3,514,000,000
Indefinite-lived Intangible Assets (Excluding Goodwill)     692,000,000        
Goodwill, Impairment Loss, net of taxes     180,000,000        
Impairment of Goodwill $ 1,153,000,000 $ 489,000,000 237,000,000 [1]        
Goodwill, Impairment Loss, Tax     $ 57,000,000        
Percentage by which the estimated fair value of each reporting unit is lowered during goodwill evaluation     1000.00%        
Realogy Brokerage Group              
Goodwill     $ 669,000,000 $ 906,000,000 $ 904,000,000   $ 893,000,000
Goodwill, Impairment Loss, net of taxes     180        
Impairment of Goodwill [1]     $ 237,000,000        
Maximum              
Remaining maturity of highly-liquid investments     3 months        
[1] The Company recognized a goodwill impairment charge of $237 million during the third quarter of 2019 related to Realogy Brokerage Group. The impairment charge of $237 million was offset by an income tax benefit of $57 million resulting in a net reduction in the carrying value of Realogy Brokerage Group of $180 million (see Note 20, "Selected Quarterly Financial Data", for additional information).