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Commitments And Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule Of Commitments And Contingencies [Line Items]      
Loss Contingency Accrual   $ 12  
Loss Contingency, Range of Possible Loss, Portion Not Accrued $ 30    
Vehicle purchase commitments over the next 12 months 7,700    
Aggregate purchase obligations 136    
Receivables due from former subsidiaries 576 622 $ 545
Liabilities accrued for asset retirement obligations 27 $ 22  
Realogy      
Schedule Of Commitments And Contingencies [Line Items]      
Receivables due from former subsidiaries 24    
Wyndham      
Schedule Of Commitments And Contingencies [Line Items]      
Receivables due from former subsidiaries $ 14