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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 | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 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 | $ (6) | $ 0 | $ (6)
Series B preferred stock |  |  |
Conversion of Stock [Line Items] |  |  |
Reduction in equivalent number of class A common stock (in shares) |  | 0 | 1
Effective price per share (in dollars per share) |  | $ 312.39 | $ 270.07
Recovery through conversion rate adjustment |  | $ 5 | $ 161
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 | $ 269.62
Recovery through conversion rate adjustment |  | $ 3 | $ 20

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