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v3.22.2.2

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, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Conversion of Stock [Line Items] |  |  |
Recovery through conversion rate adjustment | $ 0 | $ (2) | $ 5
Series B |  |  |
Conversion of Stock [Line Items] |  |  |
Reduction in equivalent number of class A common stock (in shares) | 8 | 0 | 16
Effective price per share (in dollars per share) | $ 197.93 | $ 220.84 | $ 194.31
Recovery through conversion rate adjustment | $ 135 | $ 35 | $ 72
Anniversary Releases | $ 1,510 | $ 0 | $ 3,084
Series C |  |  |
Conversion of Stock [Line Items] |  |  |
Reduction in equivalent number of class A common stock (in shares) | 10 | 0 | 22
Effective price per share (in dollars per share) | $ 197.50 | $ 220.71 | $ 194.33
Recovery through conversion rate adjustment | $ 6 | $ 20 | $ 92
Anniversary Releases | $ 1,982 | $ 0 | $ 4,216

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