Intangible Assets (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Dec. 31, 2019
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Carrying amount of total other intangibles		$ 163	$ 162
Accumulated Amortization		92	90
Net carrying amount of finite-lived and indefinite-lived intangible assets		71	72
Indefinite life—Trademarks (b) (c)
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount of indefinite-lived intangible assets	[1]	643	673
Indefinite life—Title plant shares (f)
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount of indefinite-lived intangible assets	[2]	19	19
Amortizable—Franchise agreements (a)
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount of finite-lived intangible assets	[3]	2,019	2,019
Accumulated Amortization	[3]	876	859
Net carrying amount of finite-lived intangible assets	[3]	1,143	1,160
Amortizable—License agreements (d)
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount of finite-lived intangible assets	[4]	45	45
Accumulated Amortization	[4]	12	12
Net carrying amount of finite-lived intangible assets	[4]	$ 33	33
Amortization period		50 years
Amortizable—Customer relationships (e)
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount of finite-lived intangible assets	[5]	$ 71	71
Accumulated Amortization	[5]	58	57
Net carrying amount of finite-lived intangible assets	[5]	13	14
Amortizable—Other (g)
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount of finite-lived intangible assets	[6]	28	27
Accumulated Amortization	[6]	22	21
Net carrying amount of finite-lived intangible assets	[6]	$ 6	$ 6
Realogy Franchise Group | Amortizable—Franchise agreements (a)
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Amortization period		30 years
Minimum | Amortizable—Customer relationships (e)
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Amortization period		2 years
Minimum | Amortizable—Other (g)
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Amortization period		5 years
Maximum | Amortizable—Customer relationships (e)
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Amortization period		12 years
Maximum | Amortizable—Other (g)
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Amortization period		10 years

[1] Primarily related to real estate franchise brands which are expected to generate future cash flows for an indefinite period of time. (c)Realogy Franchise Group trademarks was impaired by $30 million during the first quarter of 2020.

[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 Realogy Title Group and Realogy Brokerage Group. These relationships are being amortized over a period of 2 to 12 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 5 to 10 years.