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Equity-Based Compensation - Employee Stock Purchase Plan (Details) - USD ($)
1 Months Ended 3 Months Ended 5 Months Ended 9 Months Ended
May 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
ESPP, equity-based compensation expense, noncash         $ 28,000,000 $ 18,000,000
ESPP, equity-based compensation expense (less than)   $ 10,000,000 $ 6,000,000   28,000,000 $ 18,000,000
Employee Stock | Employee Stock Purchase Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
ESPP, equity-based compensation expense (less than)   $ 1,000,000     $ 1,000,000  
Employee Stock | Employee Stock Purchase Plan | Class A Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
ESPP, purchase period 6 months          
ESPP purchase price of common stock, percent of fair market value 90.00%          
ESPP, maximum contribution amount $ 10,000          
ESPP, number of shares available (in shares) 500,000          
ESPP, equity-based compensation expense, noncash       $ 0