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Note 11. Restructuring Costs Restructuring Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended 15 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Restructuring Reserve [Roll Forward]                    
Restructuring costs, net $ 9 $ 9 $ 12 $ 9 $ 10   $ 39 $ 10 $ (1)  
Real Estate Franchise Services                    
Restructuring Reserve [Roll Forward]                    
Restructuring costs, net             4      
Company Owned Real Estate Brokerage Services                    
Restructuring Reserve [Roll Forward]                    
Restructuring costs, net             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      
2015-2016 Business Optimization Plan [Member]                    
Restructuring Reserve [Roll Forward]                    
Balance at December 31, 2015       9 0 $ 0 9     $ 0
Restructuring costs, net         10   39 10    
Costs paid or otherwise settled         (1)   (32)      
Balance at December 31, 2016 16       9   16 9   16
Restructuring and Related Cost, Expected Cost [Abstract]                    
Total amount expected to be incurred 65           65     65
Amount incurred to date           49       49
Total amount remaining to be incurred 16           16     16
2015-2016 Business Optimization Plan [Member] | Real Estate Franchise Services                    
Restructuring and Related Cost, Expected Cost [Abstract]                    
Total amount expected to be incurred 5           5     5
Amount incurred to date           4        
Total amount remaining to be incurred 1           1     1
2015-2016 Business Optimization Plan [Member] | Company Owned Real Estate Brokerage Services                    
Restructuring and Related Cost, Expected Cost [Abstract]                    
Total amount expected to be incurred 40           40     40
Amount incurred to date           27        
Total amount remaining to be incurred 13           13     13
2015-2016 Business Optimization Plan [Member] | Relocation Services                    
Restructuring and Related Cost, Expected Cost [Abstract]                    
Total amount expected to be incurred 5           5     5
Amount incurred to date           5        
Total amount remaining to be incurred 0           0     0
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     1
Amount incurred to date           1        
Total amount remaining to be incurred 0           0     0
2015-2016 Business Optimization Plan [Member] | Corporate [Member]                    
Restructuring and Related Cost, Expected Cost [Abstract]                    
Total amount expected to be incurred 14           14     14
Amount incurred to date           12        
Total amount remaining to be incurred 2           2     2
2014 Restructuring Plan [Member]                    
Restructuring Cost and Reserve [Line Items]                    
Restructuring Reserve, Accrual Adjustment                 (1)  
Personnel-related costs | 2015-2016 Business Optimization Plan [Member]                    
Restructuring Reserve [Roll Forward]                    
Balance at December 31, 2015       3 0 0 3     0
Restructuring costs, net         3   22 [1] 3 [1]    
Costs paid or otherwise settled         0   (16)      
Balance at December 31, 2016 9       3   9 3   9
Restructuring and Related Cost, Expected Cost [Abstract]                    
Total amount expected to be incurred 35           35     35
Amount incurred to date                   25
Total amount remaining to be incurred 10           10     10
Personnel-related costs | 2014 Restructuring Plan [Member]                    
Restructuring Reserve [Roll Forward]                    
Restructuring costs, net [1]                 0  
Facility-related costs | 2015-2016 Business Optimization Plan [Member]                    
Restructuring Reserve [Roll Forward]                    
Balance at December 31, 2015       3 0 0 3     0
Restructuring costs, net         3   10 [2] 3 [2]    
Costs paid or otherwise settled         0   (6)      
Balance at December 31, 2016 7       3   7 3   7
Restructuring and Related Cost, Expected Cost [Abstract]                    
Total amount expected to be incurred 17           17     17
Amount incurred to date                   13
Total amount remaining to be incurred 4           4     4
Facility-related costs | 2014 Restructuring Plan [Member]                    
Restructuring Cost and Reserve [Line Items]                    
Restructuring Reserve, Accrual Adjustment [2]                 (1)  
Accelerated depreciation related to asset disposals | 2015-2016 Business Optimization Plan [Member]                    
Restructuring Reserve [Roll Forward]                    
Balance at December 31, 2015       0 0 0 0     0
Restructuring costs, net         0   1 0    
Costs paid or otherwise settled         0   (1)      
Balance at December 31, 2016 0       0   0 0   0
Restructuring and Related Cost, Expected Cost [Abstract]                    
Total amount expected to be incurred 2           2     2
Amount incurred to date                   1
Total amount remaining to be incurred 1           1     1
Accelerated depreciation related to asset disposals | 2014 Restructuring Plan [Member]                    
Restructuring Reserve [Roll Forward]                    
Restructuring costs, net                 0  
Other restructuring costs | 2015-2016 Business Optimization Plan [Member]                    
Restructuring Reserve [Roll Forward]                    
Balance at December 31, 2015       $ 3 0 $ 0 3     0
Restructuring costs, net         4   6 [3] 4    
Costs paid or otherwise settled         (1)   (9)      
Balance at December 31, 2016 0       $ 3   0 $ 3   0
Restructuring and Related Cost, Expected Cost [Abstract]                    
Total amount expected to be incurred 11           11     11
Amount incurred to date                   10
Total amount remaining to be incurred $ 1           $ 1     $ 1
Other restructuring costs | 2014 Restructuring Plan [Member]                    
Restructuring Reserve [Roll Forward]                    
Restructuring costs, net                 $ 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 which are primarily included in the Corporate and Other business segment.