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Earnings Per Share - Schedule of Weighted Average Number of Shares (Details) - shares shares in Millions | 3 Months Ended | 9 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
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 | 155 | 8 | 312
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 | 118 | 185 | 39
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) | 36 | 114 | 37 | 63
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 | 30 | 20 | 31

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