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Earnings Per Share - Schedule of Weighted Average Number of Shares (Detail) - shares
shares in Millions
 3 Months Ended
Dec. 31, 2024
Dec. 31, 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) 8 390
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) 186 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) 38 38
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) 21 31