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Commitments And Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule Of Commitments And Contingencies [Line Items]      
Future sublease rental inflows $ 4    
Operating leases, residual value of leased assets 305    
Loss Contingency Accrual   $ 12  
Loss Contingency, Range of Possible Loss, Portion Not Accrued 45    
Vehicle purchase commitments over the next 12 months 8,700    
Aggregate purchase obligations 178    
Receivables due from former subsidiaries 622 545 $ 520
Liabilities accrued for asset retirement obligations 22 $ 23  
Realogy      
Schedule Of Commitments And Contingencies [Line Items]      
Receivables due from former subsidiaries 27    
Wyndham      
Schedule Of Commitments And Contingencies [Line Items]      
Receivables due from former subsidiaries $ 16