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Stockholders' Equity - Share Repurchases in the Open Market (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Sep. 30, 2025
Equity, Class of Treasury Stock [Line Items]      
Total cost $ 3,765 $ 3,940  
Unsettled repurchases $ 5,576   $ 5,466
Class A common stock      
Equity, Class of Treasury Stock [Line Items]      
Shares repurchased in the open market (in shares) 11 13  
Average repurchase cost per share (in dollars per share) $ 342.13 $ 300.61  
Total cost $ 3,765 $ 3,940  
Unsettled repurchases $ 40 $ 70