v3.25.2
Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 5,272 $ 4,872 $ 14,968 $ 14,425
Class A common stock        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 4,605 $ 3,870 $ 13,067 $ 11,276
Weighted- Average Shares Outstanding - Basic (in shares) 1,709 1,610 1,720 1,591
Earnings per Share - Basic (in dollars per share) $ 2.69 $ 2.40 $ 7.60 $ 7.09
Income Allocation - Diluted $ 5,272 $ 4,872 $ 14,968 $ 14,425
Weighted- Average Shares Outstanding - Diluted (in shares) 1,959 2,029 1,973 2,038
Earnings per Share - Diluted (in dollars per share) $ 2.69 $ 2.40 $ 7.59 $ 7.08
Class B-1 common stock        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 20 $ 372 $ 57 $ 2,209
Weighted- Average Shares Outstanding - Basic (in shares) 5 97 5 196
Earnings per Share - Basic (in dollars per share) $ 4.21 $ 3.82 $ 11.88 $ 11.25
Income Allocation - Diluted $ 20 $ 371 $ 57 $ 2,206
Weighted- Average Shares Outstanding - Diluted (in shares) 5 97 5 196
Earnings per Share - Diluted (in dollars per share) $ 4.20 $ 3.81 $ 11.87 $ 11.24
Class B-2 common stock        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 497 $ 283 $ 1,408 $ 277
Weighted- Average Shares Outstanding - Basic (in shares) 120 74 120 25
Earnings per Share - Basic (in dollars per share) $ 4.13 $ 3.82 $ 11.70 $ 11.25
Income Allocation - Diluted $ 497 $ 282 $ 1,406 $ 276
Weighted- Average Shares Outstanding - Diluted (in shares) 120 74 120 25
Earnings per Share - Diluted (in dollars per share) $ 4.13 $ 3.81 $ 11.69 $ 11.24
Class C common stock        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 97 $ 275 $ 280 $ 447
Weighted- Average Shares Outstanding - Basic (in shares) 9 29 9 16
Earnings per Share - Basic (in dollars per share) $ 10.78 $ 9.62 $ 30.39 $ 28.35
Income Allocation - Diluted $ 97 $ 275 $ 280 $ 447
Weighted- Average Shares Outstanding - Diluted (in shares) 9 29 9 16
Earnings per Share - Diluted (in dollars per share) $ 10.77 $ 9.60 $ 30.35 $ 28.31
Participating securities        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Allocation - Basic $ 53 $ 72 $ 156 $ 216
Income Allocation - Diluted $ 53 $ 72 $ 156 $ 216