Segment Information - Revenues (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Segment Reporting, Revenue Reconciling Item [Line Items]
Document Period End Date	Sep. 30, 2013				Sep. 30, 2013
Revenues	$ 1,553	[1],[2]	$ 1,281	[1],[2]	$ 4,043	[1],[2]	$ 3,465	[1],[2]
Real Estate Franchise Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	193	[1],[2]	161	[1],[2]	521	[1],[2]	460	[1],[2]
Company Owned Real Estate Brokerage Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,178	[1],[2]	948	[1],[2]	3,046	[1],[2]	2,559	[1],[2]
Company Owned Real Estate Brokerage Services | Royalties and Marketing Fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Intercompany revenues	79		66		210		183
Company Owned Real Estate Brokerage Services | Referral and Relocation Fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Intercompany revenues	14		12		34		30
Relocation Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	127	[1],[2]	124	[1],[2]	322	[1],[2]	321	[1],[2]
Title and Settlement Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	134	[1],[2]	114	[1],[2]	364	[1],[2]	308	[1],[2]
Corporate and Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ (79)	[1],[2],[3]	$ (66)	[1],[2],[3]	$ (210)	[1],[2],[3]	$ (183)	[1],[2],[3]

[1] Revenues for the Relocation Services segment include intercompany referral and relocation fees paid by the Company Owned Real Estate Brokerage Services segment of $14 million and $34 million for the three and nine months ended September 30, 2013, respectively, and $12 million and $30 million for the three and nine months ended September 30, 2012, respectively. Such amounts are recorded as contra-revenues by the Company Owned Real Estate Brokerage Services segment. There are no other material inter-segment transactions.

[2] 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 $79 million and $210 million for the three and nine months ended September 30, 2013, respectively, and $66 million and $183 million for the three and nine months ended September 30, 2012, respectively. Transactions between segments are eliminated in consolidation. Such amounts are eliminated through the Corporate and Other line.

[3] Includes the elimination of transactions between segments.