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Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount of indefinite-lived intangible assets $ 614  
Gross carrying amount of total other intangibles 528 $ 534
Accumulated Amortization 422 407
Net carrying amount of finite-lived and indefinite-lived intangible assets 106 127
Indefinite life—Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount of indefinite-lived intangible assets [1] 584 586
Indefinite life—Title plant shares    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount of indefinite-lived intangible assets [2] 30 28
Amortizable—Franchise agreements    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross [3] 2,010 2,010
Accumulated Amortization [3] 1,189 1,123
Net carrying amount of finite-lived intangible assets [3] 821 887
Amortizable—License agreements    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross [4] 45 45
Accumulated Amortization [4] 17 16
Net carrying amount of finite-lived intangible assets [4] $ 28 29
Amortization period 50 years  
Amortizable—Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross [5] $ 449 454
Accumulated Amortization [5] 401 385
Net carrying amount of finite-lived intangible assets [5] 48 69
Amortizable—Other    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross [6] 4 7
Accumulated Amortization [6] 4 6
Net carrying amount of finite-lived intangible assets [6] $ 0 $ 1
Minimum | Amortizable—Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Amortization period 10 years  
Minimum | Amortizable—Other    
Finite-Lived Intangible Assets [Line Items]    
Amortization period 3 years  
Maximum | Amortizable—Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Amortization period 20 years  
Maximum | Amortizable—Other    
Finite-Lived Intangible Assets [Line Items]    
Amortization period 5 years  
Franchise Group | Amortizable—Franchise agreements    
Finite-Lived Intangible Assets [Line Items]    
Amortization period 30 years  
Owned Brokerage Group | Indefinite life—Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Indefinite-Lived Intangible Assets, Period Increase (Decrease) $ (2)  
[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. The year ended December 31, 2024 includes $2 million reduction for the sale of a business.
[2] Ownership in a title plant is required to transact title insurance in certain states. The Company expects to generate future cash flows for an indefinite period of time.
[3] Generally amortized over a period of 30 years.
[4] Relates to the Sotheby’s International Realty® and Better Homes and Gardens® Real Estate agreements which are being amortized over 50 years (the contractual term of the license agreements).
[5] Relates to the customer relationships which are being amortized over a period of 10 to 20 years.
[6] Consists of covenants not to compete which are amortized over their contract lives and other intangibles which are generally amortized over periods ranging from 3 to 5 years.