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Summary of Significant Accounting Policies - Additional Information (Detail)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Feb. 28, 2020
$ / shares
shares
Mar. 31, 2021
shares
Feb. 28, 2021
shares
Dec. 31, 2020
shares
Jun. 30, 2021
USD ($)
shares
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
shares
Jun. 30, 2020
USD ($)
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 | $         $ 12   $ 33 $ 600  
Stock-based compensation expense | $         10 $ 3 27 3  
Share-based compensation liability | $         6   6    
Additional Paid-in Capital                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Stock-based compensation expense | $         $ 10 $ 3 $ 27 $ 3  
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)         0   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
Common stock outstanding (in shares)         116,921,554   116,921,554   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    
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    
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
Common stock outstanding (in shares) 510,000,000       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