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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Apr. 23, 2024 | Oct. 31, 2023 | Sep. 30, 2023 | Oct. 31, 2022
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Share repurchase program |  |  |  |  |  | $ 25,000 |  | $ 12,000
Share repurchase programs authorized | $ 23,600 |  | $ 23,600 |  |  |  |  |
Preferred stock, shares issued (in shares) | 5 |  | 5 |  |  |  | 5 |
Dividends paid | $ 1,060 | $ 941 | $ 2,100 | $ 1,900 |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | 25 |  | 25 |  |  |  | 25 |
Series A preferred stock |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | 4 |  | 4 |  |  |  | 4 |
Series B preferred stock |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | 2 |  | 2 |  |  |  | 2 |
Series C preferred stock |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | 3 |  | 3 |  |  |  | 3 |
Class A common stock |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 2,000,000 |  | 2,000,000 |  |  |  | 2,000,000 |
Class B-1 common stock |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 499 |  | 499 |  |  |  | 622 |
Class B-2 common stock |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 123 |  | 123 |  |  |  |  |
Class B-3 common stock |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 61 |  | 61 |  |  |  |  |
Class B-4 common stock |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 31 |  | 31 |  |  |  |  |
Class B-5 common stock |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 15 |  | 15 |  |  |  |  |
Class C common stock |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 1,100 |  | 1,100 |  |  |  | 1,100 |
Subsequent Event |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Quarterly cash dividend (in dollars per share) |  |  |  |  | $ 0.52 |  |  |

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