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Earnings Per Share - Schedule of Weighted Average Number of Shares (Detail) - shares shares in Millions | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
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) | 235 | 392 | 397
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) | 77 | 0 | 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) | 64 | 39 | 40
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) | 29 | 34 | 47

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