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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 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2008
Dec. 31, 2007
Goodwill and Intangible Asset Impairment [Line Items]                  
Goodwill $ 2,499   $ 2,499 $ 2,499          
Gross carrying amount of indefinite-lived intangible assets     614            
Impairment of Goodwill     $ 0 $ 25 $ 394 $ 540 $ 253 $ 1,279 $ 507
Cartus Reporting Unit, Percentage of Fair Value in Excess of Carrying Value     900.00%            
Trademark, Percentages of Fair Value in Excess of Carrying Value 300.00%     300.00%          
Indefinite life—Trademarks                  
Goodwill and Intangible Asset Impairment [Line Items]                  
Gross carrying amount of indefinite-lived intangible assets [1] $ 586   $ 584 $ 586          
Franchise Group                  
Goodwill and Intangible Asset Impairment [Line Items]                  
Goodwill 2,367   2,367 2,367          
Impairment of Goodwill $ 25 $ 114 0 25          
Franchise Group | Indefinite life—Trademarks                  
Goodwill and Intangible Asset Impairment [Line Items]                  
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill) Costs and Expenses Costs and Expenses              
Owned Brokerage Group                  
Goodwill and Intangible Asset Impairment [Line Items]                  
Goodwill $ 1   1 1          
Impairment of Goodwill   $ 280 $ 0 $ 0          
[1] Primarily related to real estate franchise, title and relocation trademarks which are expected to generate future cash flows for an indefinite period of time. The year ended December 31, 2024 includes $2 million reduction for the sale of a business.