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Stockholders' Equity - Share Repurchases in the Open Market (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Class of Stock [Line Items]
Total cost	$ 12,182	$ 11,589	$ 8,676
Class A common stock
Class of Stock [Line Items]
Shares repurchased in the open market (in shares)	55	56	40
Average repurchase price per share (in dollars per share)	$ 222.27	$ 206.47	$ 219.03
Total cost	$ 12,182	$ 11,589	$ 8,676

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