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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, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Conversion of Stock [Line Items] |  |  |
Recovery through conversion rate adjustment | $ 1 | $ 0 | $ (2)
Series B preferred stock |  |  |
Conversion of Stock [Line Items] |  |  |
Reduction in equivalent number of class A common stock (in shares) | 0 | 8 | 0
Effective price per share (in dollars per share) | $ 219.12 | $ 197.93 | $ 220.84
Recovery through conversion rate adjustment | $ 19 | $ 135 | $ 35
Sixth Anniversary Release | $ 0 | $ 1,510 | $ 0
Series C |  |  |
Conversion of Stock [Line Items] |  |  |
Reduction in equivalent number of class A common stock (in shares) | 0 | 10 | 0
Effective price per share (in dollars per share) | $ 215.28 | $ 197.50 | $ 220.71
Recovery through conversion rate adjustment | $ 11 | $ 6 | $ 20
Sixth Anniversary Release | $ 0 | $ 1,982 | $ 0

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