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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 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 4,577 $ 4,663 $ 9,696 $ 9,553
Class A common stock        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 3,996 $ 3,616 $ 8,463 $ 7,408
Weighted- Average Shares Outstanding - Basic (in shares) 1,721 1,579 1,725 1,582
Earnings per Share - Basic (in dollars per share) $ 2.32 $ 2.29 $ 4.90 $ 4.68
Income Allocation - Diluted $ 4,577 $ 4,663 $ 9,696 $ 9,553
Weighted- Average Shares Outstanding - Diluted (in shares) 1,974 2,039 1,979 2,042
Earnings per Share - Diluted (in dollars per share) $ 2.32 $ 2.29 $ 4.90 $ 4.68
Class B-1 common stock        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 18 $ 892 $ 37 $ 1,825
Weighted- Average Shares Outstanding - Basic (in shares) 5 245 5 245
Earnings per Share - Basic (in dollars per share) $ 3.63 $ 3.63 $ 7.68 $ 7.44
Income Allocation - Diluted $ 18 $ 891 $ 37 $ 1,823
Weighted- Average Shares Outstanding - Diluted (in shares) 5 245 5 245
Earnings per Share - Diluted (in dollars per share) $ 3.63 $ 3.63 $ 7.67 $ 7.43
Class B-2 common stock        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 431   $ 911  
Weighted- Average Shares Outstanding - Basic (in shares) [1] 120 0 120 0
Earnings per Share - Basic (in dollars per share) [1] $ 3.58 $ 0 $ 7.57 $ 0
Income Allocation - Diluted $ 430   $ 909  
Weighted- Average Shares Outstanding - Diluted (in shares) [1] 120 0 120 0
Earnings per Share - Diluted (in dollars per share) [1] $ 3.58 $ 0 $ 7.56 $ 0
Class C common stock        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 85 $ 85 $ 183 $ 176
Weighted- Average Shares Outstanding - Basic (in shares) 9 9 9 9
Earnings per Share - Basic (in dollars per share) $ 9.29 $ 9.16 $ 19.62 $ 18.73
Income Allocation - Diluted $ 85 $ 85 $ 183 $ 176
Weighted- Average Shares Outstanding - Diluted (in shares) 9 9 9 9
Earnings per Share - Diluted (in dollars per share) $ 9.27 $ 9.15 $ 19.59 $ 18.71
Participating securities        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 47 $ 70 $ 102 $ 144
Income Allocation - Diluted $ 47 $ 70 $ 102 $ 144
[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.