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Stockholders' Equity - Schedule of As-Converted Class B Common Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 6 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Stockholders' Equity Note [Abstract] |  |
Reduction in equivalent number of as-converted shares of class A common stock (in shares) | 2 | 1
Effective price per share (in dollars per share) | $ 209.14 | $ 217.61
Deposits under the U.S. retrospective responsibility plan | $ 350 | $ 250

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