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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Apr. 22, 2022 | Dec. 31, 2021 | Jan. 31, 2021
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Share repurchase program |  |  |  |  |  | $ 12,000 | $ 8,000
Share repurchase programs authorized | $ 9,800 |  | $ 9,800 |  |  |  |
Cash dividends declared and paid, at a quarterly amount per Class A share | $ 802 | $ 701 | $ 1,611 | $ 1,404 |  |  |
Subsequent Event | Class A common stock |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Quarterly cash dividend (in dollars per share) |  |  |  |  | $ 0.375 |  |

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