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Stockholders' Equity - Schedule of Share Repurchase Program Disclosure (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Total cost | $ 7,894 | $ 4,473 | $ 11,659 | $ 8,413
Class A common stock |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Shares repurchased in the open market (in shares) | 25 | 13 | 36 | 26
Average repurchase cost per share (in dollars per share) | $ 320.66 | $ 340.26 | $ 327.29 | $ 320.47
Total cost | $ 7,894 | $ 4,473 | $ 11,659 | $ 8,413
Unsettled repurchases | $ 125 | $ 61 | $ 125 | $ 61

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