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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Sep. 30, 2023
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Total cost | $ 4,770 | $ 3,064 | $ 11,163 | $ 8,395 |
Unsettled repurchases | $ 4,732 |  | $ 4,732 |  | $ 5,015
Class A common stock |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Shares repurchased in the open market (in shares) | 17 | 13 | 42 | 39 |
Average repurchase cost per share (in dollars per share) | $ 276.75 | $ 229.00 | $ 263.91 | $ 214.44 |
Total cost | $ 4,770 | $ 3,064 | $ 11,163 | $ 8,395 |
Unsettled repurchases | $ 200 |  | $ 200 |  |

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