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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, 2025
Mar. 31, 2024
Conversion of Stock [Line Items]    
Reduction in equivalent number of class A common stock (in shares) 1 0
Effective price per share (in dollars per share) $ 346.79 $ 0
Deposits into the U.S. litigation escrow account $ 375 $ 0
Recovery through conversion rate adjustment $ 0 $ 0
Series B preferred stock    
Conversion of Stock [Line Items]    
Reduction in equivalent number of class A common stock (in shares) 0 0
Effective price per share (in dollars per share) $ 312.39 $ 254.32
Recovery through conversion rate adjustment $ 5 $ 22
Series C preferred stock    
Conversion of Stock [Line Items]    
Reduction in equivalent number of class A common stock (in shares) 0 0
Effective price per share (in dollars per share) $ 312.39 $ 254.32
Recovery through conversion rate adjustment $ 3 $ 3