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 | |||||