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Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]    
Income Allocation - Basic $ 5,853 $ 5,119
Class A common stock    
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]    
Income Allocation - Basic $ 5,117 $ 4,466
Weighted- Average Shares Outstanding - Basic (in shares) 1,687 1,729
Earnings per Share - Basic (in dollars per share) $ 3.03 $ 2.58
Income Allocation - Diluted $ 5,853 $ 5,119
Weighted- Average Shares Outstanding - Diluted (in shares) 1,933 1,985
Earnings per Share - Diluted (in dollars per share) $ 3.03 $ 2.58
Class B-1 common stock    
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]    
Income Allocation - Basic $ 23 $ 20
Weighted- Average Shares Outstanding - Basic (in shares) 5 5
Earnings per Share - Basic (in dollars per share) $ 4.71 $ 4.04
Income Allocation - Diluted $ 23 $ 20
Weighted- Average Shares Outstanding - Diluted (in shares) 5 5
Earnings per Share - Diluted (in dollars per share) $ 4.71 $ 4.04
Class B-2 common stock    
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]    
Income Allocation - Basic $ 555 $ 480
Weighted- Average Shares Outstanding - Basic (in shares) 120 120
Earnings per Share - Basic (in dollars per share) $ 4.61 $ 3.99
Income Allocation - Diluted $ 554 $ 479
Weighted- Average Shares Outstanding - Diluted (in shares) 120 120
Earnings per Share - Diluted (in dollars per share) $ 4.61 $ 3.98
Class C common stock    
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]    
Income Allocation - Basic $ 108 $ 98
Weighted- Average Shares Outstanding - Basic (in shares) 9 10
Earnings per Share - Basic (in dollars per share) $ 12.13 $ 10.33
Income Allocation - Diluted $ 108 $ 98
Weighted- Average Shares Outstanding - Diluted (in shares) 9 10
Earnings per Share - Diluted (in dollars per share) $ 12.11 $ 10.32
Participating securities    
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]    
Income Allocation - Basic $ 50 $ 55
Income Allocation - Diluted $ 50 $ 55