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Restructuring Costs Restructuring Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Restructuring Reserve [Roll Forward]      
Restructuring costs $ 9 $ 0  
Company Owned Brokerage Services      
Restructuring Reserve [Roll Forward]      
Restructuring costs 2    
Relocation Services      
Restructuring Reserve [Roll Forward]      
Restructuring costs 2    
2015-2016 Business Optimization Plan [Member]      
Restructuring Reserve [Roll Forward]      
Balance at December 31, 2015 9    
Restructuring costs 9 0  
Costs paid or otherwise settled (9)    
Balance at March 31, 2016 9   $ 9
Restructuring and Related Cost, Expected Cost [Abstract]      
Total amount expected to be incurred 44   44
Amount incurred to date     19
Total amount remaining to be incurred 25   25
2015-2016 Business Optimization Plan [Member] | Real Estate Franchise Services      
Restructuring and Related Cost, Expected Cost [Abstract]      
Total amount expected to be incurred 4   4
Amount incurred to date     0
Total amount remaining to be incurred 4   4
2015-2016 Business Optimization Plan [Member] | Company Owned Brokerage Services      
Restructuring and Related Cost, Expected Cost [Abstract]      
Total amount expected to be incurred 22   22
Amount incurred to date     7
Total amount remaining to be incurred 15   15
2015-2016 Business Optimization Plan [Member] | Relocation Services      
Restructuring and Related Cost, Expected Cost [Abstract]      
Total amount expected to be incurred 6   6
Amount incurred to date     3
Total amount remaining to be incurred 3   3
2015-2016 Business Optimization Plan [Member] | Title and Settlement Services      
Restructuring and Related Cost, Expected Cost [Abstract]      
Total amount expected to be incurred 1   1
Amount incurred to date     0
Total amount remaining to be incurred 1   1
2015-2016 Business Optimization Plan [Member] | Corporate Segment [Member]      
Restructuring and Related Cost, Expected Cost [Abstract]      
Total amount expected to be incurred 11   11
Amount incurred to date     9
Total amount remaining to be incurred 2   2
2015-2016 Business Optimization Plan [Member] | Personnel Related [Member]      
Restructuring Reserve [Roll Forward]      
Balance at December 31, 2015 3    
Restructuring costs [1] 2 0  
Costs paid or otherwise settled (3)    
Balance at March 31, 2016 2   2
Restructuring and Related Cost, Expected Cost [Abstract]      
Total amount expected to be incurred 20   20
Amount incurred to date     5
Total amount remaining to be incurred 15   15
2015-2016 Business Optimization Plan [Member] | Facility Related [Member]      
Restructuring Reserve [Roll Forward]      
Balance at December 31, 2015 3    
Restructuring costs [2] 2 0  
Costs paid or otherwise settled (1)    
Balance at March 31, 2016 4   4
Restructuring and Related Cost, Expected Cost [Abstract]      
Total amount expected to be incurred 14   14
Amount incurred to date     5
Total amount remaining to be incurred 9   9
2015-2016 Business Optimization Plan [Member] | Accelerated depreciation related to asset disposals [Member]      
Restructuring and Related Cost, Expected Cost [Abstract]      
Total amount expected to be incurred 1   1
Amount incurred to date     0
Total amount remaining to be incurred 1   1
2015-2016 Business Optimization Plan [Member] | Other Restructuring [Member]      
Restructuring Reserve [Roll Forward]      
Balance at December 31, 2015 3    
Restructuring costs [3] 5 $ 0  
Costs paid or otherwise settled (5)    
Balance at March 31, 2016 3   3
Restructuring and Related Cost, Expected Cost [Abstract]      
Total amount expected to be incurred 9   9
Amount incurred to date     9
Total amount remaining to be incurred $ 0   $ 0
[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.