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Fair Value Measurements and Investments - Schedule of Assets and Liabilities Measured (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Assets |  |
Investment securities | $ 2,421 | $ 5,451
Level 1 | Fair Value, Measurements, Recurring |  |
Assets |  |
Total | 16,315 | 15,684
Liabilities |  |
Total | 268 | 238
Level 1 | Fair Value, Measurements, Recurring | Deferred compensation liability |  |
Liabilities |  |
Deferred compensation liability | 268 | 238
Level 1 | Fair Value, Measurements, Recurring | Derivative instruments |  |
Liabilities |  |
Derivative instruments | 0 | 0
Level 2 | Fair Value, Measurements, Recurring |  |
Assets |  |
Total | 367 | 599
Liabilities |  |
Total | 319 | 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 | 319 | 226
Money market funds | Level 1 | Fair Value, Measurements, Recurring |  |
Assets |  |
Cash equivalents and restricted cash equivalents: | 13,760 | 10,403
Other current and non-current assets: | 28 | 25
Money market funds | Level 2 | Fair Value, Measurements, Recurring |  |
Assets |  |
Cash equivalents and restricted cash equivalents: | 0 | 0
Other current and non-current assets: | 0 | 0
U.S. Treasury securities | Level 1 | Fair Value, Measurements, Recurring |  |
Assets |  |
Cash equivalents and restricted cash equivalents: | 0 | 7
Investment securities | 2,116 | 4,948
U.S. Treasury securities | Level 2 | Fair Value, Measurements, Recurring |  |
Assets |  |
Cash equivalents and restricted cash equivalents: | 0 | 0
Investment securities | 0 | 0
Marketable equity securities | Level 1 | Fair Value, Measurements, Recurring |  |
Assets |  |
Marketable equity securities | 411 | 301
Marketable equity securities | Level 2 | Fair Value, Measurements, Recurring |  |
Assets |  |
Marketable equity securities | 0 | 0
U.S. government-sponsored debt securities | Level 1 | Fair Value, Measurements, Recurring |  |
Assets |  |
Investment securities | 0 | 0
U.S. government-sponsored debt securities | Level 2 | Fair Value, Measurements, Recurring |  |
Assets |  |
Investment securities | 305 | 496
Derivative instruments | Level 1 | Fair Value, Measurements, Recurring |  |
Assets |  |
Other current and non-current assets: | 0 | 0
Derivative instruments | Level 2 | Fair Value, Measurements, Recurring |  |
Assets |  |
Other current and non-current assets: | $ 62 | $ 103

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