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Earnings Per Share - Schedule of Weighted Average Number of Shares (Details) - shares shares in Millions | 3 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Class B-1 common stock |  |
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items] |  |
Weighted-average as-converted common stock used in income allocation (in shares) | 8 | 8
Class B-2 common stock |  |
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items] |  |
Weighted-average as-converted common stock used in income allocation (in shares) | 183 | 186
Class C common stock |  |
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items] |  |
Weighted-average as-converted common stock used in income allocation (in shares) | 36 | 38
Participating securities |  |
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items] |  |
Weighted-average as-converted common stock used in income allocation (in shares) | 17 | 21

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