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Fair Value Measurements and Investments - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Assets |  |
Investment securities | $ 2,980 | $ 5,451
Level 1 | Fair Value, Measurements, Recurring |  |
Assets |  |
Total | 16,433 | 15,684
Liabilities |  |
Total | 254 | 238
Level 1 | Fair Value, Measurements, Recurring | Deferred compensation liability |  |
Liabilities |  |
Deferred compensation liability | 254 | 238
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: | 13,412 | 10,403
Other current and non-current assets: | 27 | 25
Level 1 | U.S. Treasury securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Cash equivalents and restricted cash equivalents: | 7 | 7
Investment securities | 2,669 | 4,948
Level 1 | Marketable equity securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Marketable equity securities | 318 | 301
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 | 393 | 599
Liabilities |  |
Total | 435 | 226
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 | 435 | 226
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 |  |
Cash equivalents and restricted cash equivalents: | 0 | 0
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 | 304 | 496
Level 2 | Derivative instruments | Fair Value, Measurements, Recurring |  |
Assets |  |
Other current and non-current assets: | $ 89 | $ 103

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