Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended																12 Months Ended
	Dec. 31, 2016		Sep. 30, 2016		Jun. 30, 2016		Mar. 31, 2016		Dec. 31, 2015		Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015		Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	$ 1,370		$ 1,644		$ 1,662		$ 1,134		$ 1,325		$ 1,668		$ 1,651		$ 1,062		$ 5,810		$ 5,706		$ 5,328
Real Estate Franchise Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	188		215		221		157		177		214		213		151		781	[1],[2]	755	[1],[2]	716	[1],[2]
Real Estate Franchise Services | Royalties and Marketing Fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues																	293		295		283
Company Owned Real Estate Brokerage Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	1,004		1,231		1,268		841		992		1,267		1,289		796		4,344	[1],[2]	4,344	[1],[2]	4,078	[1],[2]
Relocation Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	97		116		109		83		98		124		108		85		405	[1],[2]	415	[1],[2]	419	[1],[2]
Relocation Services | Referral and Relocation Fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues																	43		49		42
Title and Settlement Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	149		164		149		111		125		147		128		87		573	[1],[2]	487	[1],[2]	398	[1],[2]
Corporate and Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	$ (68)	[3]	$ (82)	[3]	$ (85)	[3]	$ (58)	[3]	$ (67)	[4]	$ (84)	[4]	$ (87)	[4]	$ (57)	[4]	$ (293)	[1],[2],[5]	$ (295)	[1],[2],[5]	$ (283)	[1],[2],[5]

[1] Revenues for the Relocation Services segment include intercompany referral commissions paid by the Company Owned Real Estate Brokerage Services segment of $43 million for the year ended December 31, 2016, $49 million for the year ended December 31, 2015 and $42 million for the year ended December 31, 2014. Such amounts are recorded as contra-revenues by the Company Owned Real Estate Brokerage Services segment. There are no other material intersegment transactions.

[2] Transactions between segments are eliminated in consolidation. Revenues for the Real Estate Franchise Services segment include intercompany royalties and marketing fees paid by the Company Owned Real Estate Brokerage Services segment of $293 million for the year ended December 31, 2016, $295 million for the year ended December 31, 2015 and $283 million for the year ended December 31, 2014. Such amounts are eliminated through the Corporate and Other line.

[3] Represents the elimination of transactions primarily between the Real Estate Franchise Services segment and the Company Owned Real Estate Brokerage Services segment.

[4] Represents the elimination of transactions primarily between the Real Estate Franchise Services segment and the Company Owned Real Estate Brokerage Services segment.

[5] Includes the elimination of transactions between segments.