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Stockholders' Equity - Share Repurchases in the Open Market (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Total cost | $ 2,949 | $ 1,713 | $ 7,053 | $ 3,509
Class A common stock |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Shares repurchased in the open market (in shares) | 15 | 8 | 34 | 17
Average repurchase price per share (in dollars per share) | $ 210.18 | $ 208.65 | $ 210.26 | $ 205.05
Total cost | $ 2,949 | $ 1,713 | $ 7,053 | $ 3,509

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