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Fair Value Measurements and Investments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022
Assets
Investment securities	$ 5,265	$ 5,261
Level 1 | Recurring
Assets
Total	16,146	16,999
Liabilities
Total	171	146
Level 1 | Recurring | Deferred compensation liability
Liabilities
Deferred compensation liability	171	146
Level 1 | Recurring | Derivative instruments
Liabilities
Derivative instruments	0	0
Level 1 | Money market funds | Recurring
Assets
Cash equivalents and restricted cash equivalents:	11,548	11,736
Other current and non-current assets:	22	22
Level 1 | U.S. Treasury securities | Recurring
Assets
Cash equivalents and restricted cash equivalents:	0	799
Investment securities	4,249	4,005
Level 1 | Marketable equity securities | Recurring
Assets
Marketable equity securities	327	437
Level 1 | U.S. government-sponsored debt securities | Recurring
Assets
Investment securities	0	0
Level 1 | Derivative instruments | Recurring
Assets
Other current and non-current assets:	0	0
Level 2 | Recurring
Assets
Total	1,174	1,588
Liabilities
Total	389	418
Level 2 | Recurring | Deferred compensation liability
Liabilities
Deferred compensation liability	0	0
Level 2 | Recurring | Derivative instruments
Liabilities
Derivative instruments	389	418
Level 2 | Money market funds | Recurring
Assets
Cash equivalents and restricted cash equivalents:	0	0
Other current and non-current assets:	0	0
Level 2 | U.S. Treasury securities | Recurring
Assets
Cash equivalents and restricted cash equivalents:	0	0
Investment securities	0	0
Level 2 | Marketable equity securities | Recurring
Assets
Marketable equity securities	0	0
Level 2 | U.S. government-sponsored debt securities | Recurring
Assets
Investment securities	1,016	457
Level 2 | Derivative instruments | Recurring
Assets
Other current and non-current assets:	$ 158	$ 1,131

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