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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 | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Conversion of Stock [Line Items] |  |  |
Recovery through conversion rate adjustments | $ 0 | $ (6) | $ 1
Series B preferred stock |  |  |
Conversion of Stock [Line Items] |  |  |
Reduction in equivalent number of class A common stock (in shares) | 1 | 5 | 0
Effective price per share (in dollars per share) | $ 352.58 | $ 272.89 | $ 219.12
Recovery through conversion rate adjustments | $ 5 | $ 161 | $ 19
Anniversary Releases | $ 287 | $ 1,149 | $ 0
Series C Preferred Stock |  |  |
Conversion of Stock [Line Items] |  |  |
Reduction in equivalent number of class A common stock (in shares) | 3 | 6 | 0
Effective price per share (in dollars per share) | $ 353.32 | $ 273.24 | $ 215.28
Recovery through conversion rate adjustments | $ 3 | $ 20 | $ 11
Anniversary Releases | $ 1,137 | $ 1,569 | $ 0

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