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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
	Dec. 31, 2025	Dec. 31, 2024	Sep. 30, 2025
Equity, Class of Treasury Stock [Line Items]
Total cost	$ 3,765	$ 3,940
Unsettled repurchases	$ 5,576		$ 5,466
Class A common stock
Equity, Class of Treasury Stock [Line Items]
Shares repurchased in the open market (in shares)	11	13
Average repurchase cost per share (in dollars per share)	$ 342.13	$ 300.61
Total cost	$ 3,765	$ 3,940
Unsettled repurchases	$ 40	$ 70

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