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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 | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Sep. 30, 2024
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Total cost | $ 4,828 | $ 4,770 | $ 13,241 | $ 11,163 |
Unsettled repurchases | $ 4,907 |  | $ 4,907 |  | $ 4,909
Class A common stock |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Shares repurchased in the open market (in shares) | 14 | 17 | 40 | 42 |
Average repurchase cost per share (in dollars per share) | $ 349.24 | $ 276.75 | $ 330.39 | $ 263.91 |
Total cost | $ 4,828 | $ 4,770 | $ 13,241 | $ 11,163 |
Unsettled repurchases | $ 61 | $ 200 | $ 61 | $ 200 |

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