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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022 | Apr. 24, 2023 | Oct. 31, 2022
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Share repurchase program |  |  |  |  |  | $ 12,000
Share repurchase programs authorized | $ 11,900 |  | $ 11,900 |  |  |
Dividends paid | $ 941 | $ 802 | $ 1,900 | $ 1,600 |  |
Subsequent Event |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Quarterly cash dividend (in dollars per share) |  |  |  |  | $ 0.45 |

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