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Earnings Per Share - Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]      
Income allocation - basic earnings per share $ 19,743 $ 17,273 $ 14,957
Class A common stock      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]      
Income allocation - basic earnings per share $ 15,790 $ 13,415 $ 11,569
Weighted-average shares outstanding - basic (in shares) 1,621 1,618 1,651
Earnings per share - basic (in dollars per share) $ 9.74 $ 8.29 $ 7.01
Income allocation - diluted earnings per share $ 19,743 $ 17,273 $ 14,957
Weighted-average shares outstanding - diluted (in shares) 2,029 2,085 2,136
Earnings per share - diluted (in dollars per share) $ 9.73 $ 8.28 $ 7.00
Class B-1 common stock      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]      
Income allocation - basic earnings per share $ 2,292 $ 3,254 $ 2,781
Weighted-average shares outstanding - basic (in shares) 148 245 245
Earnings per share - basic (in dollars per share) $ 15.46 $ 13.26 $ 11.33
Income allocation - diluted earnings per share $ 2,289 $ 3,251 $ 2,778
Weighted-average shares outstanding - diluted (in shares) 148 245 245
Earnings per share - diluted (in dollars per share) $ 15.45 $ 13.24 $ 11.31
Class B-2 common stock      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]      
Income allocation - basic earnings per share $ 752    
Weighted-average shares outstanding - basic (in shares) [1] 49 0 0
Earnings per share - basic (in dollars per share) [1] $ 15.45 $ 0 $ 0
Income allocation - diluted earnings per share $ 751    
Weighted-average shares outstanding - diluted (in shares) [1] 49 0 0
Earnings per share - diluted (in dollars per share) [1] $ 15.43 $ 0 $ 0
Class C common stock      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]      
Income allocation - basic earnings per share $ 623 $ 320 $ 280
Weighted-average shares outstanding - basic (in shares) 16 10 10
Earnings per share - basic (in dollars per share) $ 38.97 $ 33.17 $ 28.03
Income allocation - diluted earnings per share $ 623 $ 319 $ 280
Weighted-average shares outstanding - diluted (in shares) 16 10 10
Earnings per share - diluted (in dollars per share) $ 38.92 $ 33.13 $ 28.00
Participating securities      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]      
Income allocation - basic earnings per share $ 286 $ 284 $ 327
Income allocation - diluted earnings per share $ 286 $ 284 $ 326
[1]
(1)No shares of class B-2 common stock were outstanding prior to the class B-1 common stock exchange offer. See Note 15—Stockholders’ Equity for further details.