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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, 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 $ 2,523 $ 2,499 $ 2,523        
Gross carrying amount of indefinite-lived intangible assets $ 614   614          
Impairment of Goodwill     $ 25 394 $ 540 $ 253 $ 1,279 $ 507
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] $ 586 611 $ 586 611        
Franchise Group                
Goodwill and Intangible Asset Impairment [Line Items]                
Goodwill 2,367 2,392 2,367 2,392        
Impairment of Goodwill $ 25 $ 114 25 114        
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 $ 0 1 0        
Impairment of Goodwill   $ 280 $ 0 $ 280        
[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. Franchise trademarks were impaired by $25 million during the fourth quarter of 2023 as a result of the Company's annual impairment assessment.