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Stockholders' Equity - Share Repurchases in the Open Market (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Class of Stock [Line Items] |  |  |
Total cost | $ 16,958 | $ 12,182 | $ 11,589
Unsettled repurchases | $ 4,909 | $ 5,015 |
Class A common stock |  |  |
Class of Stock [Line Items] |  |  |
Shares repurchased in the open market (in shares) | 64 | 55 | 56
Average repurchase cost per share (in dollars per share) | $ 266.24 | $ 222.27 | $ 206.47
Total cost | $ 16,958 | $ 12,182 | $ 11,589
Unsettled repurchases | $ 90 |  |

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