Investments, Equity Method and Joint Ventures (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jun. 30, 2022	Mar. 29, 2022
Schedule of Equity Method Investments [Line Items]
Equity Method Investments		$ 178	$ 184
Dividends received from unconsolidated entities		8	3	$ 51
Payments to Acquire Equity Method Investments		$ 1	22	39
Sotheby's % Ownership in Concierge Auctions		80.00%
Equity in (earnings) losses of unconsolidated entities		$ (9)	28	(48)
Title Insurance Underwriter Joint Venture
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage						30.00%
Title Group
Schedule of Equity Method Investments [Line Items]
Equity Method Investments		152	157
Title Group | Guaranteed Rate Affinity
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	[1]	$ 67	72
Equity Method Investment, Ownership Percentage		49.90%
Dividends received from unconsolidated entities		$ 5
Equity in (earnings) losses of unconsolidated entities		0	22	(49)
Title Group | Title Insurance Underwriter Joint Venture
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	[2]	$ 74	75
Equity Method Investment, Ownership Percentage		25.00%			26.00%
Equity in (earnings) losses of unconsolidated entities		$ (4)	(6)	0
Title Group | Other Title Group's Equity Method Investments
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	[3]	11	10
Dividends received from unconsolidated entities		3
Payments to Acquire Equity Method Investments		1
Equity in (earnings) losses of unconsolidated entities		(3)	(5)	(6)
Owned Brokerage Group | Owned Brokerage Group's Equity Method Investments
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	[4]	26	27
Loss on Sale of Investments		(3)
Equity in (earnings) losses of unconsolidated entities		$ (2)	$ 17	$ 7
Owned Brokerage Group | Real Estate Auction Joint Venture
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		50.00%
Owned Brokerage Group | RealSure Joint Venture
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		49.00%

[1] Guaranteed Rate Affinity is the Company's 49.9% minority-owned mortgage origination joint venture with Guaranteed Rate, Inc which originates and markets its mortgage lending services to the Company's real estate brokerage as well as other real estate brokerage companies across the country. The Company received $5 million in cash dividends from Guaranteed Rate Affinity during the year ended December 31, 2023.

[2] Includes the Company's 25% equity interest in the Title Insurance Underwriter Joint Venture formed in March 2022 as a result of the sale of the Company's Title Underwriter. See Note 1, "Basis of Presentation—Sale of the Title Insurance Underwriter", for additional information related to the sale of the Title Underwriter and subsequent sales of a portion of the Company's ownership in the Title Insurance Underwriter Joint Venture.

[3] Includes Title Group's various other equity method investments. The Company invested an additional $1 million and received $3 million in cash dividends related to these investments during the year ended December 31, 2023.

[4] Includes the Company's 50% owned unconsolidated real estate auction joint venture with Sotheby's which holds an 80% ownership stake in Sotheby's Concierge Auctions, a global luxury real estate auction marketplace that partners with real estate agents to host luxury online auctions for clients, the Company's former 49% investment in RealSure (operations were ceased in the fourth quarter of 2022), and other brokerage related investments. The Company recorded a $3 million loss on the sale of a brokerage related investment during the year ended December 31, 2023.