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Earnings Per Share - Schedule of Weighted Average Number of Shares (Details) - shares
shares in Millions
3 Months Ended
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