Segment Information - Operating EBITDA (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018		Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Depreciation and amortization		$ 50	$ 49	[1]	$ 99	$ 97	[1]
Depreciation and amortization, adjusted for Amortization of Intangible Assets related to GRA Acquisition	[2]		49			99
Interest expense, net		81	46		144	79
Income tax expense (benefit)		34	52		(1)	33
Restructuring costs, net	[3],[4]	9	6		21	36
Impairment		2	0		3	0
Loss on the early extinguishment of debt	[5]	0	0		5	7
Net Income (Loss) attributable to Realogy Holdings and Realogy Group		69	123		(30)	56
Equity in (earnings) losses of unconsolidated entities		(7)	(2)		(8)	2
Real Estate Franchise Services
Segment Reporting Information [Line Items]
Operating EBITDA		163	173		253	278
Restructuring costs, net					2
Company Owned Brokerage Services
Segment Reporting Information [Line Items]
Operating EBITDA		47	61		(15)	16
Restructuring costs, net		6	4		10	21
Relocation Services
Segment Reporting Information [Line Items]
Operating EBITDA		27	34		29	33
Restructuring costs, net		1	1		4	9
Title and Settlement Services
Segment Reporting Information [Line Items]
Operating EBITDA		32	31		23	25
Restructuring costs, net		1	1		2	2
Corporate and Other
Segment Reporting Information [Line Items]
Operating EBITDA	[1]	(24)	(23)		(49)	(42)
Restructuring costs, net		$ 1			$ 5	$ 2
Amortization of Intangible Assets related to GRA Acquisition
Segment Reporting Information [Line Items]
Equity in (earnings) losses of unconsolidated entities			$ 2

[1] (a) Includes the elimination of transactions between segments.

[2] (b) Depreciation and amortization for the six months ended June 30, 2018 includes $2 million of amortization expense related to Guaranteed Rate Affinity's purchase accounting included in the "Equity in (earnings) losses of unconsolidated entities" line on the Condensed Consolidated Statement of Operations.

[3] (c) The three months ended June 30, 2019 includes restructuring charges of $6 million in the Company Owned Real Estate Brokerage Services segment, $1 million in the Relocation Services segment, $1 million in the Title and Settlement Services segment and $1 million in Corporate and Other. The three months ended June 30, 2018 includes restructuring charges of $4 million in the Company Owned Real Estate Brokerage Services segment, $1 million in the Relocation Services segment and $1 million in the Title and Settlement Services segment. The six months ended June 30, 2019 includes restructuring charges of $10 million in the Company Owned Real Estate Brokerage Services segment, $4 million in the Relocation Services segment, $2 million in the Title and Settlement Services segment and $5 million in Corporate and Other. The six months ended June 30, 2018 includes restructuring charges of $2 million in the Real Estate Franchise Services segment, $21 million in the Company Owned Real Estate Brokerage Services segment, $9 million in the Relocation Services segment, $2 million in the Title and Settlement Services segment and $2 million in Corporate and Other.

[4] The three and six months ended June 30, 2019 include $9 million and $18 million, respectively, of expense related to the Facility and Operational Efficiencies Program and Leadership Realignment and zero and $3 million, respectively, of expense related to Other Restructuring Activities Program. Restructuring charges for three and six months ended June 30, 2018 relate to prior restructuring programs.

[5] (d) Loss on the early extinguishment of debt is recorded in the Corporate and Other segment.