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Stockholders' Equity - Share Repurchases in the Open Market (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Total cost | $ 2,433 | $ 2,200 | $ 9,486 | $ 5,709
Class A common stock |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Shares repurchased in the open market (in shares) | 12 | 10 | 46 | 27
Average repurchase price per share (in dollars per share) | $ 202.81 | $ 227.11 | $ 208.30 | $ 213.02
Total cost | $ 2,433 | $ 2,200 | $ 9,486 | $ 5,709

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