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Note 2. Summary of Significant Accounting Policies Investments (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]        
Equity Method Investments   $ 74 $ 66  
Income (Loss) from Equity Method Investments   (18) (12) $ (16)
Payments to Acquire Equity Method Investments   55 0 0
Company Owned Real Estate Brokerage Services | Gain from sale of PHHHL assets by Guaranteed Rate Affinity        
Schedule of Equity Method Investments [Line Items]        
Income (Loss) from Equity Method Investments   (35)    
Company Owned Real Estate Brokerage Services | Exit Costs related to PHHHL        
Schedule of Equity Method Investments [Line Items]        
Income (Loss) from Equity Method Investments   7    
Title and Settlement Services        
Schedule of Equity Method Investments [Line Items]        
Income (Loss) from Equity Method Investments   4    
Title and Settlement Services | Amortization of Intangible Assets related to GRA Acquisition        
Schedule of Equity Method Investments [Line Items]        
Income (Loss) from Equity Method Investments   $ 3    
PHH Home Loans        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Ownership Percentage   49.90%    
Equity Method Investments   $ 19 59  
Income (Loss) from Equity Method Investments       (14)
Proceeds from Equity Method Investment, Distribution $ 7 60   $ 10
PHH Home Loans | Company Owned Real Estate Brokerage Services        
Schedule of Equity Method Investments [Line Items]        
Income (Loss) from Equity Method Investments   $ 6 $ (8)  
Guaranteed Rate Affinity        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Ownership Percentage   49.90%    
Equity Method Investment, Unowned Percentage   50.10%    
Equity Method Investments   $ 48