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Fair Value Measurements and Investments - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Sep. 30, 2025
--- | --- | ---
Assets |  |
Investment securities | $ 1,393 | $ 2,421
Level 1 | Fair Value, Measurements, Recurring |  |
Assets |  |
Total | 9,875 | 16,315
Liabilities |  |
Total | 266 | 268
Level 1 | Fair Value, Measurements, Recurring | Deferred compensation liability |  |
Liabilities |  |
Deferred compensation liability | 266 | 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: | 8,154 | 13,760
Other current and non-current assets: | 33 | 28
Level 1 | Marketable equity securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Marketable equity securities | 424 | 411
Level 1 | U.S. government-sponsored debt securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Investment securities | 0 | 0
Level 1 | U.S. Treasury securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Investment securities | 1,264 | 2,116
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 | 288 | 367
Liabilities |  |
Total | 234 | 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 | 234 | 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 | 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 | 129 | 305
Level 2 | U.S. Treasury securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Investment securities | 0 | 0
Level 2 | Derivative instruments | Fair Value, Measurements, Recurring |  |
Assets |  |
Other current and non-current assets: | $ 159 | $ 62

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