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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 19, 2024 | May 08, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Jul. 23, 2024 | May 06, 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 |  |  | $ 18,900 |  | $ 18,900 |  |  |  |  |  |
Dividends paid |  |  | $ 1,056 | $ 937 | $ 3,200 | $ 2,800 |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  | 25,000,000 |  | 25,000,000 |  |  |  |  | 25,000,000 |
Series A preferred stock |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  | 4,000,000 |  | 4,000,000 |  |  |  |  | 4,000,000 |
Series B preferred stock |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  | 2,000,000 |  | 2,000,000 |  |  |  |  | 2,000,000 |
Series C preferred stock |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  | 3,000,000 |  | 3,000,000 |  |  |  |  | 3,000,000 |
Class A common stock |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  | 2,000,000,000,000.0 |  | 2,000,000,000,000.0 |  |  |  |  | 2,000,000,000,000.0 |
Class B-1 common stock |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock tendered during period, shares, stock exchange offer (in shares) |  |  |  |  |  |  |  | 241,000,000 |  |  |
Common stock, shares authorized (in shares) |  |  | 499,000,000 |  | 499,000,000 |  |  |  |  | 622,000,000 |
Class B-2 common stock |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock issued during the period, new issues (in shares) |  | 120,000,000 |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  | 123,000,000 |  | 123,000,000 |  |  |  |  |  |
Class B-3 common stock |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  | 61,000,000 |  | 61,000,000 |  |  |  |  |  |
Class B-4 common stock |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  | 31,000,000 |  | 31,000,000 |  |  |  |  |  |
Class B-5 common stock |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  | 15,000,000 |  | 15,000,000 |  |  |  |  |  |
Class C common stock |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock issued during the period, new issues (in shares) |  | 48,000,000 |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  | 1,100,000,000 |  | 1,100,000,000 |  |  |  |  | 1,100,000,000 |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Quarterly cash dividend (in dollars per share) |  |  |  |  |  |  | $ 0.52 |  |  |  |
Subsequent Event | Series A preferred stock |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock issued during the period, new issues (in shares) | 99,264 |  |  |  |  |  |  |  |  |  |

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