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Goodwill (Details)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 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]            
Balance at December 31, 2022 $ 2,523          
Goodwill acquired (a) [1] 1          
Balance at June 30, 2023 2,524 $ 2,523        
Accumulated Impairment Losses [2] 2,973          
Impairment Loss   394 $ 540 $ 253 $ 1,279 $ 507
Franchise Group            
Goodwill [Roll Forward]            
Balance at December 31, 2022 2,392          
Goodwill acquired (a) [1] 0          
Balance at June 30, 2023 2,392 2,392        
Accumulated Impairment Losses [2] 1,561          
Owned Brokerage Group            
Goodwill [Roll Forward]            
Balance at December 31, 2022 0          
Goodwill acquired (a) [1] 1          
Balance at June 30, 2023 1 0        
Accumulated Impairment Losses [2] $ 1,088          
Number of Businesses Acquired | real_estate_brokerage_operations 1          
Title Group            
Goodwill [Roll Forward]            
Balance at December 31, 2022 $ 131          
Goodwill acquired (a) [1] 0          
Balance at June 30, 2023 131 $ 131        
Accumulated Impairment Losses [2] $ 324          
[1] Goodwill acquired during the six months ended June 30, 2023 relates to the acquisition of one real estate brokerage operation.
[2] Includes impairment charges which reduced goodwill by $394 million during 2022, $540 million during 2020, $253 million during 2019, $1,279 million during 2008 and $507 million during 2007.