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Note 13. Commitments And Contingencies Litigation and Tax Matters (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Loss Contingencies [Line Items]    
Guaranty Arrangement Percentage of Obligations Assumed by Realogy   62.50%
Guaranty Arrangement Percentage of Obligations Assumed by Wyndham   37.50%
Due to former parent $ 18 $ 21
Strader    
Loss Contingencies [Line Items]    
Legal Fees $ 8