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Stockholders' Equity - Effect of VE Territory Covered Losses Through Conversion Rate Adjustments (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Conversion of Stock [Line Items]    
Recovery through conversion rate adjustment $ 0 $ 0
Series B preferred stock    
Conversion of Stock [Line Items]    
Reduction in equivalent number of as-converted shares of class A common stock (in shares) 0 0
Effective price per share (in dollars per share) $ 201.68 $ 209.89
Recovery through conversion rate adjustment $ 26 $ 9
Series C preferred stock    
Conversion of Stock [Line Items]    
Reduction in equivalent number of as-converted shares of class A common stock (in shares) 0 0
Effective price per share (in dollars per share) $ 201.68 $ 209.89
Recovery through conversion rate adjustment $ 3 $ 6