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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Sep. 30, 2023
Equity, Class of Treasury Stock [Line Items]
Total cost	$ 4,770	$ 3,064	$ 11,163	$ 8,395
Unsettled repurchases	$ 4,732		$ 4,732		$ 5,015
Class A common stock
Equity, Class of Treasury Stock [Line Items]
Shares repurchased in the open market (in shares)	17	13	42	39
Average repurchase cost per share (in dollars per share)	$ 276.75	$ 229.00	$ 263.91	$ 214.44
Total cost	$ 4,770	$ 3,064	$ 11,163	$ 8,395
Unsettled repurchases	$ 200		$ 200

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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