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Restructuring Costs Restructuring Costs (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]    
Restructuring costs $ 5 $ 9
Restructuring Reserve [Roll Forward]    
Restructuring costs 5 9
Company Owned Brokerage Services    
Restructuring Cost and Reserve [Line Items]    
Restructuring costs 5 2
Restructuring Reserve [Roll Forward]    
Restructuring costs 5 2
Relocation Services    
Restructuring Cost and Reserve [Line Items]    
Restructuring costs   2
Restructuring Reserve [Roll Forward]    
Restructuring costs   2
Business Optimization Plan [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring costs 5 9
Restructuring Reserve [Roll Forward]    
Balance at December 31, 2016 16  
Restructuring costs 5 9
Costs paid or otherwise settled (8)  
Balance at March 31, 2017 13  
Restructuring and Related Cost, Expected Cost [Abstract]    
Total amount expected to be incurred 65  
Amount incurred to date 54  
Total amount remaining to be incurred 11  
Business Optimization Plan [Member] | Real Estate Franchise Services    
Restructuring and Related Cost, Expected Cost [Abstract]    
Total amount expected to be incurred 5  
Amount incurred to date 4  
Total amount remaining to be incurred 1  
Business Optimization Plan [Member] | Company Owned Brokerage Services    
Restructuring and Related Cost, Expected Cost [Abstract]    
Total amount expected to be incurred 39  
Amount incurred to date 32  
Total amount remaining to be incurred 7  
Business Optimization Plan [Member] | Relocation Services    
Restructuring and Related Cost, Expected Cost [Abstract]    
Total amount expected to be incurred 5  
Amount incurred to date 5  
Total amount remaining to be incurred 0  
Business Optimization Plan [Member] | Title and Settlement Services    
Restructuring and Related Cost, Expected Cost [Abstract]    
Total amount expected to be incurred 1  
Amount incurred to date 1  
Total amount remaining to be incurred 0  
Business Optimization Plan [Member] | Corporate Segment [Member]    
Restructuring and Related Cost, Expected Cost [Abstract]    
Total amount expected to be incurred 15  
Amount incurred to date 12  
Total amount remaining to be incurred 3  
Business Optimization Plan [Member] | Personnel Related [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring costs [1] 5 2
Restructuring Reserve [Roll Forward]    
Balance at December 31, 2016 9  
Restructuring costs [1] 5 2
Costs paid or otherwise settled (6)  
Balance at March 31, 2017 8  
Restructuring and Related Cost, Expected Cost [Abstract]    
Total amount expected to be incurred 34  
Amount incurred to date 30  
Total amount remaining to be incurred 4  
Business Optimization Plan [Member] | Facility Related [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring costs [2] 0 2
Restructuring Reserve [Roll Forward]    
Balance at December 31, 2016 7  
Restructuring costs [2] 0 2
Costs paid or otherwise settled (2)  
Balance at March 31, 2017 5  
Restructuring and Related Cost, Expected Cost [Abstract]    
Total amount expected to be incurred 17  
Amount incurred to date 13  
Total amount remaining to be incurred 4  
Business Optimization Plan [Member] | Accelerated depreciation related to asset disposals [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring costs 0 0
Restructuring Reserve [Roll Forward]    
Balance at December 31, 2016 0  
Restructuring costs 0 0
Costs paid or otherwise settled 0  
Balance at March 31, 2017 0  
Restructuring and Related Cost, Expected Cost [Abstract]    
Total amount expected to be incurred 3  
Amount incurred to date 1  
Total amount remaining to be incurred 2  
Business Optimization Plan [Member] | Other Restructuring [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring costs [3] 0 5
Restructuring Reserve [Roll Forward]    
Balance at December 31, 2016 0  
Restructuring costs [3] 0 $ 5
Costs paid or otherwise settled 0  
Balance at March 31, 2017 0  
Restructuring and Related Cost, Expected Cost [Abstract]    
Total amount expected to be incurred 11  
Amount incurred to date 10  
Total amount remaining to be incurred $ 1  
[1] Personnel-related costs consist of severance costs provided to employees who have been terminated and duplicate payroll costs during transition.
[2] Facility-related costs consist of costs associated with planned facility closures such as contract termination costs, lease payments that will continue to be incurred under the contract for its remaining term without economic benefit to the Company and other facility and employee relocation related costs.
[3] Other restructuring costs consist of costs related to professional fees, consulting fees and other costs associated with restructuring activities which are primarily included in the Corporate and Other business segment.