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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, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Net income $ 3,647 $ 3,026 $ 7,606 $ 6,152
Class A common stock        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 2,819 $ 2,342 $ 5,884 $ 4,752
Weighted- Average Shares Outstanding - Basic (in shares) 1,654 1,695 1,662 1,695
Earnings per Share - Basic (in dollars per share) $ 1.70 $ 1.38 $ 3.54 $ 2.80
Income Allocation - Diluted $ 3,647 $ 3,026 $ 7,606 $ 6,152
Weighted- Average Shares Outstanding - Diluted (in shares) 2,142 2,193 2,150 2,196
Earnings per Share - Diluted (in dollars per share) $ 1.70 $ 1.38 $ 3.54 $ 2.80
Class B common stock        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 677 $ 550 $ 1,409 $ 1,117
Weighted- Average Shares Outstanding - Basic (in shares) 245 245 245 245
Earnings per Share - Basic (in dollars per share) $ 2.76 $ 2.24 $ 5.74 $ 4.55
Income Allocation - Diluted $ 676 $ 550 $ 1,407 $ 1,116
Weighted- Average Shares Outstanding - Diluted (in shares) 245 245 245 245
Earnings per Share - Diluted (in dollars per share) $ 2.75 $ 2.24 $ 5.73 $ 4.54
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 $ 69 $ 59 $ 143 $ 120
Weighted- Average Shares Outstanding - Basic (in shares) 10 11 10 11
Earnings per Share - Basic (in dollars per share) $ 6.82 $ 5.52 $ 14.16 $ 11.22
Income Allocation - Diluted $ 69 $ 59 $ 143 $ 120
Weighted- Average Shares Outstanding - Diluted (in shares) 10 11 10 11
Earnings per Share - Diluted (in dollars per share) $ 6.81 $ 5.52 $ 14.15 $ 11.20
Weighted-average as-converted common stock used in income allocation (in shares) 40 43 40 43
Participating securities        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 82 $ 75 $ 170 $ 163
Income Allocation - Diluted $ 81 $ 74 $ 169 $ 163
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 12 6 17
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) 16 16 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