Intangible Assets (Details) - USD ($) $ in Millions		3 Months Ended			12 Months Ended
		Dec. 31, 2022	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount of indefinite-lived intangible assets		$ 639			$ 639
Gross carrying amount of total other intangibles		540			540	$ 542
Accumulated Amortization		390			390	371
Net carrying amount of finite-lived and indefinite-lived intangible assets		150			150	171
Indefinite life—Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount of indefinite-lived intangible assets	[1]	611			611	687
Indefinite life—Title plant shares
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount of indefinite-lived intangible assets	[2]	28			28	25
Amortizable—Franchise agreements
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	[3]	2,010			2,010	2,010
Accumulated Amortization	[3]	1,056			1,056	989
Net carrying amount of finite-lived intangible assets	[3]	954			954	1,021
Amortizable—License agreements
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	[4]	45			45	45
Accumulated Amortization	[4]	15			15	14
Net carrying amount of finite-lived intangible assets	[4]	30			$ 30	31
Amortization period					50 years
Amortizable—Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	[5]	456			$ 456	456
Accumulated Amortization	[5]	366			366	345
Net carrying amount of finite-lived intangible assets	[5]	90			90	111
Amortizable—Other
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	[6]	11			11	16
Accumulated Amortization	[6]	9			9	12
Net carrying amount of finite-lived intangible assets	[6]	$ 2			$ 2	$ 4
Minimum | Amortizable—Customer relationships
Finite-Lived Intangible Assets [Line Items]
Amortization period					7 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 | Indefinite life—Trademarks
Finite-Lived Intangible Assets [Line Items]
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]		Costs and Expenses	Costs and Expenses	Costs and Expenses
Franchise Group | Amortizable—Franchise agreements
Finite-Lived Intangible Assets [Line Items]
Amortization period					30 years

[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 $76 million during the fourth quarter of 2022.

[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 at Franchise Group, Title Group and Owned Brokerage Group. These relationships are being amortized over a period of 7 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.