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Fair Value Measurements and Investments - Assets and Liabilities Measured (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Assets
Investment securities	$ 5,725	$ 5,261
Liabilities
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Liabilities	Liabilities
Fair Value, Measurements, Recurring | Level 1
Assets
Total	$ 18,483	$ 16,999
Liabilities
Deferred compensation liability	175	146
Derivative instruments	0	0
Total	175	146
Fair Value, Measurements, Recurring | Level 1 | Money market funds
Assets
Cash equivalents and restricted cash equivalents:	13,504	11,736
Other current and non-current assets:	23	22
Fair Value, Measurements, Recurring | Level 1 | U.S. government-sponsored debt securities
Assets
Investment securities	0	0
Fair Value, Measurements, Recurring | Level 1 | Marketable equity securities
Assets
Marketable equity securities	339	437
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury securities
Assets
Cash equivalents and restricted cash equivalents:	301	799
Investment securities	4,316	4,005
Fair Value, Measurements, Recurring | Level 1 | Derivative instruments
Assets
Other current and non-current assets:	0	0
Fair Value, Measurements, Recurring | Level 2
Assets
Total	1,401	1,588
Liabilities
Deferred compensation liability	0	0
Derivative instruments	396	418
Total	396	418
Fair Value, Measurements, Recurring | Level 2 | Money market funds
Assets
Cash equivalents and restricted cash equivalents:	0	0
Other current and non-current assets:	0	0
Fair Value, Measurements, Recurring | Level 2 | U.S. government-sponsored debt securities
Assets
Investment securities	1,108	457
Fair Value, Measurements, Recurring | Level 2 | Marketable equity securities
Assets
Marketable equity securities	0	0
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury securities
Assets
Cash equivalents and restricted cash equivalents:	0	0
Investment securities	0	0
Fair Value, Measurements, Recurring | Level 2 | Derivative instruments
Assets
Other current and non-current assets:	$ 293	$ 1,131

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