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Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents (Details) - USD ($) $ in Millions	Mar. 31, 2026	Sep. 30, 2025	Mar. 31, 2025	Sep. 30, 2024
Restricted Cash and Cash Equivalent Item [Line Items]
Cash and cash equivalents	$ 12,404	$ 17,164
Cash, cash equivalents, restricted cash and restricted cash equivalents	18,706	24,987	$ 19,136	$ 19,763
U.S. litigation escrow
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash and restricted cash equivalents:	665	2,990
Customer collateral
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash and restricted cash equivalents:	4,292	3,625
Prepaid expenses and other current assets
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash and restricted cash equivalents:	$ 1,345	$ 1,208