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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 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 4,257 $ 3,647 $ 8,436 $ 7,606
Class A common stock        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 3,307 $ 2,819 $ 6,549 $ 5,884
Weighted- Average Shares Outstanding - Basic (in shares) 1,624 1,654 1,627 1,662
Earnings per Share - Basic (in dollars per share) $ 2.04 $ 1.70 $ 4.03 $ 3.54
Income Allocation - Diluted $ 4,257 $ 3,647 $ 8,436 $ 7,606
Weighted- Average Shares Outstanding - Diluted (in shares) 2,093 2,142 2,098 2,150
Earnings per Share - Diluted (in dollars per share) $ 2.03 $ 1.70 $ 4.02 $ 3.54
Class B common stock        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 800 $ 677 $ 1,584 $ 1,409
Weighted- Average Shares Outstanding - Basic (in shares) 245 245 245 245
Earnings per Share - Basic (in dollars per share) $ 3.26 $ 2.76 $ 6.45 $ 5.74
Income Allocation - Diluted $ 799 $ 676 $ 1,582 $ 1,407
Weighted- Average Shares Outstanding - Diluted (in shares) 245 245 245 245
Earnings per Share - Diluted (in dollars per share) $ 3.25 $ 2.75 $ 6.44 $ 5.73
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 $ 79 $ 69 $ 157 $ 143
Weighted- Average Shares Outstanding - Basic (in shares) 10 10 10 10
Earnings per Share - Basic (in dollars per share) $ 8.15 $ 6.82 $ 16.10 $ 14.16
Income Allocation - Diluted $ 79 $ 69 $ 156 $ 143
Weighted- Average Shares Outstanding - Diluted (in shares) 10 10 10 10
Earnings per Share - Diluted (in dollars per share) $ 8.14 $ 6.81 $ 16.09 $ 14.15
Weighted-average as-converted common stock used in income allocation (in shares) 39 40 39 40
Participating securities        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 71 $ 82 $ 146 $ 170
Income Allocation - Diluted $ 71 $ 81 $ 146 $ 169
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) 10 6 11 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 16 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