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Stockholders' Equity - Schedule of Effect of VE Territory Covered Losses Recovery on the Company Repurchasing its Common Stock (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Conversion of Stock [Line Items]    
Reduction in equivalent number of class A common stock (in shares) 2 1
Effective price per share (in dollars per share) $ 345.17 $ 346.79
Deposits into the U.S. litigation escrow account $ 625 $ 375
Recovery through conversion rate adjustments $ (1) $ 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) $ 330.96 $ 312.39
Recovery through conversion rate adjustments $ 60 $ 5
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) $ 330.96 $ 312.39
Recovery through conversion rate adjustments $ 49 $ 3