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Goodwill (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2008
Dec. 31, 2007
Dec. 31, 2024
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              
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 [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              
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] (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              
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] (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              
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]                
Accumulated Impairment Loss, beginning of period (324)              
Goodwill, Impairment Loss 0              
Accumulated Impairment Loss, end of period [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.