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Summary of Significant Accounting Policies - Additional Information (Detail)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2020
$ / shares
shares
Mar. 31, 2021
USD ($)
shares
Feb. 28, 2021
shares
Dec. 31, 2020
shares
Mar. 31, 2021
USD ($)
shares
Mar. 31, 2021
USD ($)
shares
Mar. 31, 2020
USD ($)
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              
Non-cash stock-based compensation expense | $         $ 15 $ 21 $ 160  
Stock-based compensation expense | $         11 17    
Share-based compensation liability | $   $ 4     4 4    
Additional Paid-in Capital                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Stock-based compensation expense | $         $ 11 $ 17    
Restricted Stock Units (RSUs)                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Shares issued under Omnibus Incentive Plan (in shares)           61,423    
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)         30,509 33,062    
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 1,000,000,000   1,000,000,000
Common stock outstanding (in shares)   116,921,411     116,921,411 116,921,411   88,578,361
Shares issued in period (in shares)       4,321,259        
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     31,169,099 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     1,000,000 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 1,000,000,000   1,000,000,000
Common stock outstanding (in shares) 510,000,000 397,461,268     397,461,268 397,461,268   421,450,000
Exchange of LLC units for class B shares (in shares)   968,920   18,265,183        
Conversion of Class B shares (in shares)     4,754,626          
Class B Common Stock | IPO                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Common stock outstanding (in shares) 421,450,000