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Stockholders' Equity - Schedule of Effect of U.S. Retrospective Responsibility Plan on the Company Class Common B As-Converted Shares (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Equity [Abstract] |  |  |
Reduction in equivalent number of class A common stock (in shares) | 3 | 5 | 5
Effective price per share (in dollars per share) | $ 343.41 | $ 274.62 | $ 221.33
Deposits into the U.S. litigation escrow account | $ 875 | $ 1,500 | $ 1,000

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