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Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]    
Income Allocation - Basic $ 5,119 $ 4,890
Class A common stock    
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]    
Income Allocation - Basic $ 4,466 $ 3,792
Weighted- Average Shares Outstanding - Basic (in shares) 1,729 1,584
Earnings per Share - Basic (in dollars per share) $ 2.58 $ 2.39
Income Allocation - Diluted $ 5,119 $ 4,890
Weighted- Average Shares Outstanding - Diluted (in shares) 1,985 2,045
Earnings per Share - Diluted (in dollars per share) $ 2.58 $ 2.39
Class B-1 common stock    
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]    
Income Allocation - Basic $ 20 $ 933
Weighted- Average Shares Outstanding - Basic (in shares) 5 245
Earnings per Share - Basic (in dollars per share) $ 4.04 $ 3.80
Income Allocation - Diluted $ 20 $ 932
Weighted- Average Shares Outstanding - Diluted (in shares) 5 245
Earnings per Share - Diluted (in dollars per share) $ 4.04 $ 3.80
Class B-2 common stock    
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]    
Income Allocation - Basic $ 480  
Weighted- Average Shares Outstanding - Basic (in shares) [1] 120 0
Earnings per Share - Basic (in dollars per share) [1] $ 3.99 $ 0
Income Allocation - Diluted $ 479  
Weighted- Average Shares Outstanding - Diluted (in shares) [1] 120 0
Earnings per Share - Diluted (in dollars per share) [1] $ 3.98 $ 0
Class C common stock    
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]    
Income Allocation - Basic $ 98 $ 91
Weighted- Average Shares Outstanding - Basic (in shares) 10 9
Earnings per Share - Basic (in dollars per share) $ 10.33 $ 9.58
Income Allocation - Diluted $ 98 $ 91
Weighted- Average Shares Outstanding - Diluted (in shares) 10 9
Earnings per Share - Diluted (in dollars per share) $ 10.32 $ 9.57
Participating securities    
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]    
Income Allocation - Basic $ 55 $ 74
Income Allocation - Diluted $ 55 $ 74
[1] No shares of class B-2 common stock were outstanding prior to the class B-1 common stock exchange offer in May 2024. See Note 9—Stockholders’ Equity for further details.