Segment Information Segment Information - Reconciliation of Assets from Segment to Consolidated (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting, Asset Reconciling Item [Line Items]
Segment Assets	$ 7,445	$ 7,350	$ 7,569
Real Estate Franchise Services
Segment Reporting, Asset Reconciling Item [Line Items]
Segment Assets	4,667	4,730
Company Owned Real Estate Brokerage Services
Segment Reporting, Asset Reconciling Item [Line Items]
Segment Assets	888	840
Relocation Services
Segment Reporting, Asset Reconciling Item [Line Items]
Segment Assets	1,262	1,369
Title and Settlement Services
Segment Reporting, Asset Reconciling Item [Line Items]
Segment Assets	313	290
Corporate and Other
Segment Reporting, Asset Reconciling Item [Line Items]
Segment Assets	$ 315	$ 121