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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Net income $ 3,411 $ 2,575 $ 11,017 $ 8,727
Class A common stock        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 2,634 $ 1,996 $ 8,518 $ 6,748
Weighted- Average Shares Outstanding - Basic (in shares) 1,642 1,691 1,655 1,693
Earnings per Share - Basic (in dollars per share) $ 1.60 $ 1.18 $ 5.15 $ 3.99
Income Allocation - Diluted $ 3,411 $ 2,575 $ 11,017 $ 8,727
Weighted- Average Shares Outstanding - Diluted (in shares) 2,129 2,184 2,143 2,192
Earnings per Share - Diluted (in dollars per share) $ 1.60 $ 1.18 $ 5.14 $ 3.98
Class B common stock        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 637 $ 470 $ 2,046 $ 1,588
Weighted- Average Shares Outstanding - Basic (in shares) 245 245 245 245
Earnings per Share - Basic (in dollars per share) $ 2.59 $ 1.92 $ 8.33 $ 6.47
Income Allocation - Diluted $ 636 $ 470 $ 2,044 $ 1,586
Weighted- Average Shares Outstanding - Diluted (in shares) 245 245 245 245
Earnings per Share - Diluted (in dollars per share) $ 2.59 $ 1.91 $ 8.33 $ 6.46
Weighted-average as-converted common stock used in income allocation (in shares) 397 398 398 398
Class C common stock        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 64 $ 49 $ 207 $ 169
Weighted- Average Shares Outstanding - Basic (in shares) 10 10 10 11
Earnings per Share - Basic (in dollars per share) $ 6.42 $ 4.72 $ 20.58 $ 15.94
Income Allocation - Diluted $ 64 $ 49 $ 207 $ 169
Weighted- Average Shares Outstanding - Diluted (in shares) 10 10 10 11
Earnings per Share - Diluted (in dollars per share) $ 6.41 $ 4.72 $ 20.56 $ 15.92
Weighted-average as-converted common stock used in income allocation (in shares) 40 42 40 42
Participating securities        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 76 $ 60 $ 246 $ 222
Income Allocation - Diluted $ 76 $ 60 $ 246 $ 221
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) 6 9 6 14
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) 15 15 16 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) 22 22 22 22