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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Apr. 21, 2020 | Jan. 31, 2020 | Jan. 31, 2019
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Share repurchase program |  |  |  |  |  | $ 9,500 | $ 8,500
January 2020 share repurchase program remaining authorized funds | $ 8,100 |  | $ 8,100 |  |  |  |
Cash dividends declared and paid, at a quarterly amount per Class A share | $ 668 | $ 569 | $ 1,339 | $ 1,141 |  |  |
Subsequent Event | Class A common stock |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Quarterly cash dividend (in dollars per share) |  |  |  |  | $ 0.30 |  |

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