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Earnings Per Share - Schedule of Weighted Average Number of Shares as Converted (Details) - shares shares in Millions | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Class B-1 common stock |  |  |
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] |  |  |
Weighted-average as-converted common stock used in income allocation (in shares) | 8 | 235 | 392
Class B-2 common stock |  |  |
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] |  |  |
Weighted-average as-converted common stock used in income allocation (in shares) | 185 | 77 | 0
Class C common stock |  |  |
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] |  |  |
Weighted-average as-converted common stock used in income allocation (in shares) | 37 | 64 | 39
Participating securities |  |  |
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] |  |  |
Weighted-average as-converted common stock used in income allocation (in shares) | 20 | 29 | 34

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