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Restructuring Costs Restructuring Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Restructuring Cost and Reserve [Line Items]        
Restructuring costs $ 2 $ 12 $ 7 $ 21
Restructuring Reserve [Roll Forward]        
Restructuring costs 2 12 7 21
Real Estate Franchise Services        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs 1 3 1 3
Restructuring Reserve [Roll Forward]        
Restructuring costs 1 3 1 3
Company Owned Brokerage Services        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs 1 7 6 9
Restructuring Reserve [Roll Forward]        
Restructuring costs 1 7 6 9
Relocation Services        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs   1   3
Restructuring Reserve [Roll Forward]        
Restructuring costs   1   3
Business Optimization Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs 2 12 7 21
Restructuring Reserve [Roll Forward]        
Balance at December 31, 2016     16  
Restructuring costs 2 12 7 21
Costs paid or otherwise settled     (14)  
Balance at June 30, 2017 9   9  
Restructuring and Related Cost, Expected Cost [Abstract]        
Total amount expected to be incurred 61   61  
Amount incurred to date     56  
Total amount remaining to be incurred 5   5  
Business Optimization Plan | Real Estate Franchise Services        
Restructuring and Related Cost, Expected Cost [Abstract]        
Total amount expected to be incurred 5   5  
Amount incurred to date     5  
Total amount remaining to be incurred 0   0  
Business Optimization Plan | Company Owned Brokerage Services        
Restructuring and Related Cost, Expected Cost [Abstract]        
Total amount expected to be incurred 35   35  
Amount incurred to date     33  
Total amount remaining to be incurred 2   2  
Business Optimization Plan | Relocation Services        
Restructuring and Related Cost, Expected Cost [Abstract]        
Total amount expected to be incurred 5   5  
Amount incurred to date     5  
Total amount remaining to be incurred 0   0  
Business Optimization Plan | Title and Settlement Services        
Restructuring and Related Cost, Expected Cost [Abstract]        
Total amount expected to be incurred 1   1  
Amount incurred to date     1  
Total amount remaining to be incurred 0   0  
Business Optimization Plan | Corporate Segment        
Restructuring and Related Cost, Expected Cost [Abstract]        
Total amount expected to be incurred 15   15  
Amount incurred to date     12  
Total amount remaining to be incurred 3   3  
Business Optimization Plan | Personnel Related        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs [1] 1 9 6 11
Restructuring Reserve [Roll Forward]        
Balance at December 31, 2016     9  
Restructuring costs [1] 1 9 6 11
Costs paid or otherwise settled     (11)  
Balance at June 30, 2017 4   4  
Restructuring and Related Cost, Expected Cost [Abstract]        
Total amount expected to be incurred 32   32  
Amount incurred to date     31  
Total amount remaining to be incurred 1   1  
Business Optimization Plan | Facility Related        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs [2] 1 3 1 5
Restructuring Reserve [Roll Forward]        
Balance at December 31, 2016     7  
Restructuring costs [2] 1 3 1 5
Costs paid or otherwise settled     (3)  
Balance at June 30, 2017 5   5  
Restructuring and Related Cost, Expected Cost [Abstract]        
Total amount expected to be incurred 16   16  
Amount incurred to date     14  
Total amount remaining to be incurred 2   2  
Business Optimization Plan | Accelerated depreciation related to asset disposals        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs 0 0 0 0
Restructuring Reserve [Roll Forward]        
Balance at December 31, 2016     0  
Restructuring costs 0 0 0 0
Costs paid or otherwise settled     0  
Balance at June 30, 2017 0   0  
Restructuring and Related Cost, Expected Cost [Abstract]        
Total amount expected to be incurred 2   2  
Amount incurred to date     1  
Total amount remaining to be incurred 1   1  
Business Optimization Plan | Other Restructuring        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs [3] 0 0 0 5
Restructuring Reserve [Roll Forward]        
Balance at December 31, 2016     0  
Restructuring costs [3] 0 $ 0 0 $ 5
Costs paid or otherwise settled     0  
Balance at June 30, 2017 0   0  
Restructuring and Related Cost, Expected Cost [Abstract]        
Total amount expected to be incurred 11   11  
Amount incurred to date     10  
Total amount remaining to be incurred $ 1   $ 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.