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Goodwill (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
real_estate_brokerage_operations
Dec. 31, 2022
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2008
USD ($)
Dec. 31, 2007
USD ($)
Goodwill [Roll Forward]                  
Goodwill Balance, beginning of period     $ 5,497 $ 5,496          
Goodwill acquired     0 1 [1]          
Goodwill, Written off Related to Sale of Business Unit     0 0          
Goodwill Balance, end of period $ 5,497 $ 5,496 5,497 5,497 $ 5,496        
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]                  
Accumulated Impairment Loss, beginning of period     (2,998) (2,973)          
Goodwill, Impairment Loss     0 (25) (394) $ (540) $ (253) $ (1,279) $ (507)
Accumulated Impairment Loss, end of period (2,998) (2,973) (2,998) [2] (2,998) (2,973)        
Goodwill, Total 2,499   2,499 2,499          
Impairment of Goodwill     0 25 394 $ 540 $ 253 $ 1,279 $ 507
Franchise Group                  
Goodwill [Roll Forward]                  
Goodwill Balance, beginning of period     3,953 3,953          
Goodwill acquired     0 0 [1]          
Goodwill, Written off Related to Sale of Business Unit     0 0          
Goodwill Balance, end of period 3,953 3,953 3,953 3,953 3,953        
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]                  
Accumulated Impairment Loss, beginning of period     (1,586) (1,561)          
Goodwill, Impairment Loss (25) (114) 0 (25)          
Accumulated Impairment Loss, end of period (1,586) (1,561) (1,586) [2] (1,586) (1,561)        
Goodwill, Total 2,367   2,367 2,367          
Impairment of Goodwill $ 25 $ 114 0 25          
Franchise Group | Indefinite life—Trademarks                  
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]                  
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill) Costs and Expenses Costs and Expenses              
Owned Brokerage Group                  
Goodwill [Roll Forward]                  
Goodwill Balance, beginning of period     1,089 1,088          
Goodwill acquired     0 1 [1]          
Goodwill, Written off Related to Sale of Business Unit     0 0          
Goodwill Balance, end of period $ 1,089 $ 1,088 1,089 1,089 1,088        
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]                  
Accumulated Impairment Loss, beginning of period     (1,088) (1,088)          
Goodwill, Impairment Loss   (280) 0 0          
Accumulated Impairment Loss, end of period (1,088) (1,088) (1,088) [2] (1,088) (1,088)        
Goodwill, Total 1   1 1          
Impairment of Goodwill   280 0 $ 0          
Number of Businesses Acquired | real_estate_brokerage_operations       1          
Title Group                  
Goodwill [Roll Forward]                  
Goodwill Balance, beginning of period     455 $ 455          
Goodwill acquired     0 0 [1]          
Goodwill, Written off Related to Sale of Business Unit     0 0          
Goodwill Balance, end of period 455 455 455 455 455        
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]                  
Accumulated Impairment Loss, beginning of period     (324) (324)          
Goodwill, Impairment Loss     0 0          
Accumulated Impairment Loss, end of period (324) $ (324) (324) [2] (324) $ (324)        
Goodwill, Total $ 131   131 131          
Impairment of Goodwill     $ 0 $ 0          
[1] Goodwill acquired during the year ended December 31, 2023 relates to the acquisition of one real estate brokerage operation.
[2] Includes impairment charges which reduced goodwill by $25 million during 2023, $394 million during 2022, $540 million during 2020, $253 million during 2019, $1,279 million during 2008 and $507 million during 2007.