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Stockholders' Equity - 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, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Conversion of Stock [Line Items] |  |  |
Recovery through conversion rate adjustment | $ (6) | $ 1 | $ 0
Series B preferred stock |  |  |
Conversion of Stock [Line Items] |  |  |
Reduction in equivalent number of class A common stock (in shares) | 5 | 0 | 8
Effective price per share (in dollars per share) | $ 272.89 | $ 219.12 | $ 197.93
Recovery through conversion rate adjustment | $ 161 | $ 19 | $ 135
Anniversary Releases | $ 1,149 | $ 0 | $ 1,510
Series C Preferred Stock |  |  |
Conversion of Stock [Line Items] |  |  |
Reduction in equivalent number of class A common stock (in shares) | 6 | 0 | 10
Effective price per share (in dollars per share) | $ 273.24 | $ 215.28 | $ 197.50
Recovery through conversion rate adjustment | $ 20 | $ 11 | $ 6
Anniversary Releases | $ 1,569 | $ 0 | $ 1,982

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