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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, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Conversion of Stock [Line Items] |  |  |  |
Recovery through conversion rate adjustment | $ (6) | $ 0 | $ (6) | $ 1
Series B preferred stock |  |  |  |
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) |  |  | $ 270.07 | $ 219.12
Recovery through conversion rate adjustment |  |  | $ 161 | $ 19
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) |  |  | $ 269.62 | $ 215.28
Recovery through conversion rate adjustment |  |  | $ 20 | $ 11

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