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Fair Value Measurements and Investments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Sep. 30, 2023
--- | --- | ---
Assets |  |
Investment securities | $ 7,540 | $ 5,725
Level 1 | Recurring |  |
Assets |  |
Total | 16,673 | 18,483
Liabilities |  |
Total | 221 | 175
Level 1 | Recurring | Deferred compensation liability |  |
Liabilities |  |
Deferred compensation liability | 221 | 175
Level 1 | Recurring | Derivative instruments |  |
Liabilities |  |
Derivative instruments | 0 | 0
Level 1 | Money market funds | Recurring |  |
Assets |  |
Cash equivalents and restricted cash equivalents: | 10,316 | 13,504
Other current and non-current assets: | 28 | 23
Level 1 | U.S. government-sponsored debt securities | Recurring |  |
Assets |  |
Cash equivalents and restricted cash equivalents: | 0 | 0
Investment securities | 0 | 0
Level 1 | U.S. Treasury securities | Recurring |  |
Assets |  |
Cash equivalents and restricted cash equivalents: | 95 | 301
Investment securities | 5,837 | 4,316
Level 1 | Marketable equity securities | Recurring |  |
Assets |  |
Marketable equity securities | 397 | 339
Level 1 | Derivative instruments | Recurring |  |
Assets |  |
Other current and non-current assets: | 0 | 0
Level 2 | Recurring |  |
Assets |  |
Total | 1,762 | 1,401
Liabilities |  |
Total | 287 | 396
Level 2 | Recurring | Deferred compensation liability |  |
Liabilities |  |
Deferred compensation liability | 0 | 0
Level 2 | Recurring | Derivative instruments |  |
Liabilities |  |
Derivative instruments | 287 | 396
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. government-sponsored debt securities | Recurring |  |
Assets |  |
Cash equivalents and restricted cash equivalents: | 28 | 0
Investment securities | 1,580 | 1,108
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 | Derivative instruments | Recurring |  |
Assets |  |
Other current and non-current assets: | $ 154 | $ 293

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