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Goodwill (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2008
Dec. 31, 2007
Goodwill [Roll Forward]              
Goodwill Balance, beginning of period $ 5,497            
Goodwill acquired 0            
Goodwill, Written off Related to Sale of Business Unit 0            
Goodwill Balance, end of period 5,497 $ 5,497          
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]              
Accumulated Impairment Loss, beginning of period (2,998)            
Goodwill, Impairment Loss 0 (25) $ (394) $ (540) $ (253) $ (1,279) $ (507)
Accumulated Impairment Loss, end of period (2,998) [1] (2,998)          
Goodwill, Total 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            
Goodwill acquired 0            
Goodwill, Written off Related to Sale of Business Unit 0            
Goodwill Balance, end of period 3,953 3,953          
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]              
Accumulated Impairment Loss, beginning of period (1,586)            
Goodwill, Impairment Loss 0            
Accumulated Impairment Loss, end of period (1,586) [1] (1,586)          
Goodwill, Total 2,367            
Impairment of Goodwill 0            
Owned Brokerage Group              
Goodwill [Roll Forward]              
Goodwill Balance, beginning of period 1,089            
Goodwill acquired 0            
Goodwill, Written off Related to Sale of Business Unit 0            
Goodwill Balance, end of period 1,089 1,089          
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]              
Accumulated Impairment Loss, beginning of period (1,088)            
Goodwill, Impairment Loss 0            
Accumulated Impairment Loss, end of period (1,088) [1] (1,088)          
Goodwill, Total 1            
Impairment of Goodwill 0            
Title Group              
Goodwill [Roll Forward]              
Goodwill Balance, beginning of period 455            
Goodwill acquired 0            
Goodwill, Written off Related to Sale of Business Unit 0            
Goodwill Balance, end of period 455 455          
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]              
Accumulated Impairment Loss, beginning of period (324)            
Goodwill, Impairment Loss 0            
Accumulated Impairment Loss, end of period (324) [1] $ (324)          
Goodwill, Total 131            
Impairment of Goodwill $ 0            
[1] 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.