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Earnings Per Share - Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 4,156 $ 3,411 $ 12,592 $ 11,017
Class A common stock        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 3,228 $ 2,634 $ 9,778 $ 8,518
Weighted- Average Shares Outstanding - Basic (in shares) 1,614 1,642 1,623 1,655
Earnings per Share - Basic (in dollars per share) $ 2.00 $ 1.60 $ 6.03 $ 5.15
Income Allocation - Diluted $ 4,156 $ 3,411 $ 12,592 $ 11,017
Weighted- Average Shares Outstanding - Diluted (in shares) 2,080 2,129 2,092 2,143
Earnings per Share - Diluted (in dollars per share) $ 2.00 $ 1.60 $ 6.02 $ 5.14
Class B common stock        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 785 $ 637 $ 2,369 $ 2,046
Weighted- Average Shares Outstanding - Basic (in shares) 245 245 245 245
Earnings per Share - Basic (in dollars per share) $ 3.20 $ 2.59 $ 9.65 $ 8.33
Income Allocation - Diluted $ 784 $ 636 $ 2,366 $ 2,044
Weighted- Average Shares Outstanding - Diluted (in shares) 245 245 245 245
Earnings per Share - Diluted (in dollars per share) $ 3.19 $ 2.59 $ 9.64 $ 8.33
Weighted-average as-converted common stock used in income allocation (in shares) 393 397 393 398
Class C common stock        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 77 $ 64 $ 233 $ 207
Weighted- Average Shares Outstanding - Basic (in shares) 10 10 10 10
Earnings per Share - Basic (in dollars per share) $ 8.00 $ 6.42 $ 24.10 $ 20.58
Income Allocation - Diluted $ 76 $ 64 $ 233 $ 207
Weighted- Average Shares Outstanding - Diluted (in shares) 10 10 10 10
Earnings per Share - Diluted (in dollars per share) $ 7.99 $ 6.41 $ 24.08 $ 20.56
Weighted-average as-converted common stock used in income allocation (in shares) 38 40 39 40
Participating securities        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 66 $ 76 $ 212 $ 246
Income Allocation - Diluted $ 66 $ 76 $ 211 $ 246
Series A preferred 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 6 10 6
Series B preferred 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) 7 15 7 16
Series C preferred 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) 11 22 11 22