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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, 2023
Sep. 30, 2022
Sep. 30, 2021
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]      
Income allocation - basic earnings per share $ 17,273 $ 14,957 $ 12,311
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 $ 13,415 $ 11,569 $ 9,527
Weighted-average shares outstanding - basic (in shares) 1,618 1,651 1,691
Earnings per share - basic (in dollars per share) $ 8.29 $ 7.01 $ 5.63
Income allocation - diluted earnings per share $ 17,273 $ 14,957 $ 12,311
Weighted-average shares outstanding - diluted (in shares) 2,085 2,136 2,188
Earnings per share - diluted (in dollars per share) $ 8.28 $ 7.00 $ 5.63
Class B 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 $ 3,254 $ 2,781 $ 2,244
Weighted-average shares outstanding - basic (in shares) 245 245 245
Earnings per share - basic (in dollars per share) $ 13.26 $ 11.33 $ 9.14
Income allocation - diluted earnings per share $ 3,251 $ 2,778 $ 2,242
Weighted-average shares outstanding - diluted (in shares) 245 245 245
Earnings per share - diluted (in dollars per share) $ 13.24 $ 11.31 $ 9.13
Weighted average number shares as-converted basis (in shares) 392 397 398
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 $ 320 $ 280 $ 237
Weighted-average shares outstanding - basic (in shares) 10 10 10
Earnings per share - basic (in dollars per share) $ 33.17 $ 28.03 $ 22.53
Income allocation - diluted earnings per share $ 319 $ 280 $ 236
Weighted-average shares outstanding - diluted (in shares) 10 10 10
Earnings per share - diluted (in dollars per share) $ 33.13 $ 28.00 $ 22.51
Weighted average number shares as-converted basis (in shares) 39 40 42
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 $ 284 $ 327 $ 303
Income allocation - diluted earnings per share $ 284 $ 326 $ 303
Weighted average number shares as-converted basis (in shares) 10 8 12
Series B      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]      
Weighted average number shares as-converted basis (in shares) 7 14 16
Series C      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]      
Weighted average number shares as-converted basis (in shares) 11 20 22