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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, 2024
Dec. 31, 2023
Sep. 30, 2024
Equity, Class of Treasury Stock [Line Items]      
Total cost $ 3,940 $ 3,609  
Unsettled repurchases $ 4,690   $ 4,909
Class A common stock      
Equity, Class of Treasury Stock [Line Items]      
Shares repurchased in the open market (in shares) 13 15  
Average repurchase cost per share (in dollars per share) $ 300.61 $ 238.47  
Total cost $ 3,940 $ 3,609  
Unsettled repurchases $ 70