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Note 11. Restructuring Costs Restructuring Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restructuring Reserve [Roll Forward]                        
Restructuring costs, net $ 3 $ 2 $ 2 $ 5 $ 9 $ 9 $ 12 $ 9   $ 12 $ 39 $ 10
Real Estate Franchise Services                        
Restructuring Reserve [Roll Forward]                        
Restructuring costs, net                   1    
Company Owned Real Estate Brokerage Services                        
Restructuring Reserve [Roll Forward]                        
Restructuring costs, net                   9 22 5
Relocation Services                        
Restructuring Reserve [Roll Forward]                        
Restructuring costs, net                     4 1
Title and Settlement Services                        
Restructuring Reserve [Roll Forward]                        
Restructuring costs, net                   1 1  
Business Optimization Plan [Member]                        
Restructuring Reserve [Roll Forward]                        
Balance at October 1, 2015       16       9 $ 0 16 9  
Restructuring costs, net                 10 12 39 10
Costs paid or otherwise settled                 (1) (21) (32)  
Balance at December 31, 2017 7       16       9 7 16 9
Restructuring and Related Cost, Expected Cost [Abstract]                        
Total amount expected to be incurred 63                 63    
Amount incurred to date                   61    
Total amount remaining to be incurred 2                 2    
Business Optimization Plan [Member] | 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 [Member] | Company Owned Real Estate Brokerage Services                        
Restructuring and Related Cost, Expected Cost [Abstract]                        
Total amount expected to be incurred 36                 36    
Amount incurred to date                   36    
Total amount remaining to be incurred 0                 0    
Business Optimization Plan [Member] | 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 [Member] | Title and Settlement Services                        
Restructuring and Related Cost, Expected Cost [Abstract]                        
Total amount expected to be incurred 2                 2    
Amount incurred to date                   2    
Total amount remaining to be incurred 0                 0    
Business Optimization Plan [Member] | Corporate [Member]                        
Restructuring and Related Cost, Expected Cost [Abstract]                        
Total amount expected to be incurred 15                 15    
Amount incurred to date                   13    
Total amount remaining to be incurred 2                 2    
Personnel-related costs | Business Optimization Plan [Member]                        
Restructuring Reserve [Roll Forward]                        
Balance at October 1, 2015       9       3 0 9 3  
Restructuring costs, net                 3 7 22 3 [1]
Costs paid or otherwise settled                 0 (13) (16)  
Balance at December 31, 2017 3       9       3 3 9 3
Restructuring and Related Cost, Expected Cost [Abstract]                        
Total amount expected to be incurred 32                 32    
Amount incurred to date                   32    
Total amount remaining to be incurred 0                 0    
Facility-related costs | Business Optimization Plan [Member]                        
Restructuring Reserve [Roll Forward]                        
Balance at October 1, 2015       7       3 0 7 3  
Restructuring costs, net                 3 3 10 3 [2]
Costs paid or otherwise settled                 0 (7) (6)  
Balance at December 31, 2017 3       7       3 3 7 3
Restructuring and Related Cost, Expected Cost [Abstract]                        
Total amount expected to be incurred 16                 16    
Amount incurred to date                   16    
Total amount remaining to be incurred 0                 0    
Accelerated depreciation related to asset disposals | Business Optimization Plan [Member]                        
Restructuring Reserve [Roll Forward]                        
Balance at October 1, 2015       0       0 0 0 0  
Restructuring costs, net                 0 1 1 0
Costs paid or otherwise settled                 0 0 (1)  
Balance at December 31, 2017 1       0       0 1 0 0
Restructuring and Related Cost, Expected Cost [Abstract]                        
Total amount expected to be incurred 3                 3    
Amount incurred to date                   2    
Total amount remaining to be incurred 1                 1    
Other restructuring costs | Business Optimization Plan [Member]                        
Restructuring Reserve [Roll Forward]                        
Balance at October 1, 2015       $ 0       $ 3 0 0 3  
Restructuring costs, net                 4 1 [3] 6 [3] 4 [3]
Costs paid or otherwise settled                 (1) (1) (9)  
Balance at December 31, 2017 0       $ 0       $ 3 0 $ 0 $ 3
Restructuring and Related Cost, Expected Cost [Abstract]                        
Total amount expected to be incurred 12                 12    
Amount incurred to date                   11    
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.