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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
May 31, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Jul. 29, 2025 | Apr. 30, 2025 | Oct. 31, 2023
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Share repurchase program |  |  |  |  |  |  | $ 30,000 | $ 25,000
Share repurchase programs authorized |  | $ 29,800 |  | $ 29,800 |  |  |  |
Dividends paid |  | $ 1,154 | $ 1,056 | $ 3,500 | $ 3,200 |  |  |
Class B-1 common stock |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Stock tendered during period, shares, stock exchange offer (in shares) | 241 |  |  |  |  |  |  |
Class B-2 common stock |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Stock issued during the period, new issues (in shares) | 120 |  |  |  |  |  |  |
Class C common stock |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Stock issued during the period, new issues (in shares) | 48 |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Quarterly cash dividend (in dollars per share) |  |  |  |  |  | $ 0.59 |  |

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