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Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Restricted Cash and Cash Equivalent Item [Line Items]
Cash and cash equivalents	$ 17,164	$ 11,975
Cash, cash equivalents, restricted cash and restricted cash equivalents	24,987	19,763	$ 21,990	$ 20,377
U.S. litigation escrow
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash and restricted cash equivalents:	2,990	3,089
Customer collateral
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash and restricted cash equivalents:	3,625	3,524
Prepaid expenses and other current assets
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash and restricted cash equivalents:	$ 1,208	$ 1,175