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Summary of Significant Accounting Policies - Additional Information (Detail)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended
Feb. 28, 2020
$ / shares
shares
Mar. 31, 2021
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Sep. 30, 2021
shares
Sep. 30, 2020
shares
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Capital stock authorized (in shares) 2,100,000,000          
Preferred stock authorized (in shares) 100,000,000          
Preferred stock par value (in dollars per share) | $ / shares $ 1.00          
Stock split, conversion ratio 477,242.614671815          
Preferred stock outstanding (in shares) 0          
Award requisite service period     4 years      
Non-cash stock-based compensation expense | $     $ 24 $ 6    
Stock-based compensation expense | $     31 6    
Share-based compensation liability | $     2      
Additional Paid-in Capital            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Non-cash stock-based compensation expense | $     22      
Stock-based compensation expense | $     31 $ 6    
Share-based compensation liability | $     $ 9      
Restricted Stock Units (RSUs)            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Shares issued under Omnibus Incentive Plan (in shares)     215,613      
Restricted Stock Units (RSUs) | Omnibus Incentive Plan            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Shares issued under Omnibus Incentive Plan (in shares)     151,046 2,553    
Restricted Stock            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Award requisite service period     1 year      
IPO            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Award requisite service period     1 year      
Class A Common Stock            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Common stock authorized (in shares) 1,000,000,000   1,000,000,000   1,000,000,000  
Common stock outstanding (in shares)     127,236,783   122,414,827  
Class A Common Stock | Common Stock            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Common stock outstanding (in shares)     127,236,783 111,167,356 122,414,827 88,578,361
Shares issued under Omnibus Incentive Plan (in shares)     151,046 2,553    
Conversion of Class B shares (in shares)     4,670,910      
Exchange of LLC units for class B shares (in shares)       18,265,183    
Class A Common Stock | Omnibus Incentive Plan            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Common stock available for issuance (in shares)     31,169,099      
Incentive plan period     10 years      
Class A Common Stock | IPO            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Common stock outstanding (in shares) 88,550,000          
Class A Common Stock | IPO | Omnibus Incentive Plan            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Common stock available for issuance (in shares)     1,000,000      
Class B Common Stock            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Common stock authorized (in shares) 1,000,000,000   1,000,000,000   1,000,000,000  
Common stock outstanding (in shares) 510,000,000   387,300,086   391,970,996  
Conversion of Class B shares (in shares)     4,160,745      
Exchange of LLC units for class B shares (in shares)   510,165        
Class B Common Stock | Common Stock            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Common stock outstanding (in shares)     387,300,086 403,184,814 391,970,996 421,450,000
Conversion of Class B shares (in shares)     4,670,910      
Exchange of LLC units for class B shares (in shares)       18,265,186    
Class B Common Stock | IPO            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Common stock outstanding (in shares) 421,450,000