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Commitments And Contingencies (Detail)
$ in Millions
1 Months Ended 12 Months Ended
Feb. 28, 2017
case
Dec. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Schedule Of Commitments And Contingencies [Line Items]          
Number of cases brought by plaintiffs | case 2        
Liability net of recoverable insurance proceeds     $ 12    
Range of possible loss (up to)   $ 35      
Purchase obligation over the next twelve months   5,900      
Purchase commitment period decrease   2,800      
Aggregate purchase obligations   149      
Receivables due from former subsidiaries   134   $ 162 $ 576
Liabilities accrued for asset retirement obligations   28   $ 30  
Realogy          
Schedule Of Commitments And Contingencies [Line Items]          
Receivables due from former subsidiaries   26      
Wyndham          
Schedule Of Commitments And Contingencies [Line Items]          
Receivables due from former subsidiaries   $ 15