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Summary of Significant Accounting Policies Impairment of Goodwill, Intangible Assets and Other Long-Lived Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2022
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2008
Dec. 31, 2007
Dec. 31, 2021
Goodwill and Intangible Asset Impairment [Line Items]                      
Goodwill $ 2,523 $ 2,910       $ 2,523 $ 2,910 $ 3,460     $ 2,923
Gross carrying amount of indefinite-lived intangible assets 639         639          
Goodwill, Impairment Loss           (394) [1] (540) [2] (253) $ (1,279) $ (507)  
Indefinite life—Trademarks                      
Goodwill and Intangible Asset Impairment [Line Items]                      
Gross carrying amount of indefinite-lived intangible assets [3] 611         611         687
Owned Brokerage Group                      
Goodwill and Intangible Asset Impairment [Line Items]                      
Goodwill 0 245       0 245 669     259
Goodwill, Impairment Loss (280)   $ (413)     (280) [1] (413) [2]        
Franchise Group                      
Goodwill and Intangible Asset Impairment [Line Items]                      
Goodwill 2,392 2,509       2,392 2,509 $ 2,636     $ 2,506
Goodwill, Impairment Loss $ (114) $ (22)     $ (105) $ (114) [1] $ (127) [2]        
Franchise Group | Amortizable—Customer relationships                      
Goodwill and Intangible Asset Impairment [Line Items]                      
Impairment of Intangible Assets, Finite-lived       $ 18              
Franchise Group | Indefinite life—Trademarks                      
Goodwill and Intangible Asset Impairment [Line Items]                      
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration] Costs and Expenses Costs and Expenses Costs and Expenses                
[1] During the year ended December 31, 2022, the Company recognized a goodwill impairment charge of $280 million related to Owned Brokerage Group reporting unit and a goodwill impairment charge of $114 million related to the Cartus/Leads Group reporting unit which is reported within the Franchise Group reportable segment.
[2] During the year ended December 31, 2020, the Company recognized a goodwill impairment charges of $413 million related to Owned Brokerage Group and $127 million at Franchise Group which related to $105 million during the nine months ended September 30, 2020 (while Cartus was held for sale) to reduce the net assets to the estimated proceeds and an additional goodwill impairment charge of $22 million during the fourth quarter of 2020 related to Cartus.
[3] Primarily related to real estate franchise, title and relocation trademarks which are expected to generate future cash flows for an indefinite period of time. Franchise trademarks were impaired by $76 million during the fourth quarter of 2022.