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Stockholders' Equity - Schedule of As-Converted Class B 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
Equity [Abstract] |  |
Reduction in equivalent number of class A common stock (in shares) | 4 |
Effective price per share (in dollars per share) | $ 205.06 |
Deposits under the U.S. retrospective responsibility plan | $ 850 | $ 0

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- Definition Number of shares, on an as-converted basis, that have been repurchased through the Escrow Funding during the period. + References No definition available. + Details
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