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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025 | Apr. 30, 2026 | Apr. 28, 2026 | Apr. 30, 2025
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Share repurchase program |  |  |  |  |  |  | $ 30,000
Share repurchase programs authorized | $ 13,200 |  | $ 13,200 |  |  |  |
Dividends paid | $ 1,286 | $ 1,164 | $ 2,600 | $ 2,300 |  |  |
Subsequent Event |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Share repurchase program |  |  |  |  | $ 20,000 |  |
Quarterly cash dividend (in dollars per share) |  |  |  |  |  | $ 0.67 |

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