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Fair Value Measurements and Investments - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2025	Sep. 30, 2025
Assets
Investment securities	$ 1,697	$ 2,421
Level 1 | Fair Value, Measurements, Recurring
Assets
Total	14,242	16,315
Liabilities
Total	300	268
Level 1 | Fair Value, Measurements, Recurring | Deferred compensation liability
Liabilities
Deferred compensation liability	300	268
Level 1 | Fair Value, Measurements, Recurring | Derivative instruments
Liabilities
Derivative instruments	0	0
Level 1 | Money market funds | Fair Value, Measurements, Recurring
Assets
Cash equivalents and restricted cash equivalents:	12,272	13,760
Other current and non-current assets:	25	28
Level 1 | U.S. Treasury securities | Fair Value, Measurements, Recurring
Assets
Investment securities	1,517	2,116
Level 1 | Marketable equity securities | Fair Value, Measurements, Recurring
Assets
Marketable equity securities	428	411
Level 1 | U.S. government-sponsored debt securities | Fair Value, Measurements, Recurring
Assets
Investment securities	0	0
Level 1 | Derivative instruments | Fair Value, Measurements, Recurring
Assets
Other current and non-current assets:	0	0
Level 2 | Fair Value, Measurements, Recurring
Assets
Total	263	367
Liabilities
Total	230	319
Level 2 | Fair Value, Measurements, Recurring | Deferred compensation liability
Liabilities
Deferred compensation liability	0	0
Level 2 | Fair Value, Measurements, Recurring | Derivative instruments
Liabilities
Derivative instruments	230	319
Level 2 | Money market funds | Fair Value, Measurements, Recurring
Assets
Cash equivalents and restricted cash equivalents:	0	0
Other current and non-current assets:	0	0
Level 2 | U.S. Treasury securities | Fair Value, Measurements, Recurring
Assets
Investment securities	0	0
Level 2 | Marketable equity securities | Fair Value, Measurements, Recurring
Assets
Marketable equity securities	0	0
Level 2 | U.S. government-sponsored debt securities | Fair Value, Measurements, Recurring
Assets
Investment securities	180	305
Level 2 | Derivative instruments | Fair Value, Measurements, Recurring
Assets
Other current and non-current assets:	$ 83	$ 62

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