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Note 3. Acquisitions Acquisitions (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Aug. 31, 2014
USD ($)
Offices
Dec. 31, 2016
USD ($)
real_estate_brokerage_operations
Dec. 31, 2015
USD ($)
real_estate_brokerage_operations
Dec. 31, 2014
USD ($)
real_estate_brokerage_operations
Business Acquisition [Line Items]        
Goodwill acquired   $ 72 $ 141 $ 142
Zip Realty [Member]        
Business Acquisition [Line Items]        
Cash consideration paid for acquisition $ 167      
Goodwill acquired 92      
Software and Fixed Assets Acquired 18      
Deferred Tax Assets Acquired 46      
Other Assets Acquired 6      
Other Liabilities Acquired $ 6      
Number Of Offices Acquired | Offices 23      
Title and Settlement Services        
Business Acquisition [Line Items]        
Goodwill acquired   $ 20 $ 47 $ 5
Title and Settlement Services | TRG Business Combinations [Member]        
Business Acquisition [Line Items]        
Number of businesses acquired | real_estate_brokerage_operations   1 3 3
Cash consideration paid for acquisition   $ 24 $ 34 $ 6
Liabilities established related to acquisition   10 37  
Goodwill acquired   20 47 5
Other Assets Acquired   6 1  
Other Liabilities Acquired   9    
Company Owned Real Estate Brokerage Services        
Business Acquisition [Line Items]        
Goodwill acquired   $ 52 $ 94 $ 86
Company Owned Real Estate Brokerage Services | NRT Business Combinations [Member]        
Business Acquisition [Line Items]        
Number of businesses acquired | real_estate_brokerage_operations   11 13 16
Cash consideration paid for acquisition   $ 74 $ 96 $ 44
Liabilities established related to acquisition   9 13 19
Goodwill acquired   52 94 45
Other Assets Acquired   5 7 3
Other Liabilities Acquired   $ 3 3 1
Amortizable—Pendings and listings (f)        
Business Acquisition [Line Items]        
Useful Life of Pendings and Listings   5 months    
Amortizable—Pendings and listings (f) | Zip Realty [Member]        
Business Acquisition [Line Items]        
Finite-lived Intangible Assets Acquired $ 3      
Amortizable—Pendings and listings (f) | Title and Settlement Services | TRG Business Combinations [Member]        
Business Acquisition [Line Items]        
Finite-lived Intangible Assets Acquired   $ 5 8 1
Amortizable—Pendings and listings (f) | Company Owned Real Estate Brokerage Services | NRT Business Combinations [Member]        
Business Acquisition [Line Items]        
Finite-lived Intangible Assets Acquired   6 10 4
Amortizable—Other (g) | Zip Realty [Member]        
Business Acquisition [Line Items]        
Finite-lived Intangible Assets Acquired 7      
Amortizable—Other (g) | Title and Settlement Services | TRG Business Combinations [Member]        
Business Acquisition [Line Items]        
Finite-lived Intangible Assets Acquired   2 5  
Amortizable—Other (g) | Company Owned Real Estate Brokerage Services | NRT Business Combinations [Member]        
Business Acquisition [Line Items]        
Finite-lived Intangible Assets Acquired   3 1 8
Amortizable—Customer relationships (d) | Zip Realty [Member]        
Business Acquisition [Line Items]        
Finite-lived Intangible Assets Acquired $ 1      
Amortizable—Customer relationships (d) | Company Owned Real Estate Brokerage Services | NRT Business Combinations [Member]        
Business Acquisition [Line Items]        
Finite-lived Intangible Assets Acquired   20    
Unamortizable—Trademarks (b) | Title and Settlement Services | TRG Business Combinations [Member]        
Business Acquisition [Line Items]        
Indefinite-lived Intangible Assets Acquired   3 9  
Unamortizable—Trademarks (b) | Company Owned Real Estate Brokerage Services | NRT Business Combinations [Member]        
Business Acquisition [Line Items]        
Indefinite-lived Intangible Assets Acquired       $ 4
Unamortizable—Title plant shares (e) | Title and Settlement Services | TRG Business Combinations [Member]        
Business Acquisition [Line Items]        
Indefinite-lived Intangible Assets Acquired   $ 7 $ 1