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Fair Value Measurements and Investments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Recurring - USD ($) $ in Millions | Jun. 30, 2022 | Sep. 30, 2021
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Level 1 |  |
Assets |  |
Total | $ 17,082 | $ 17,658
Liabilities |  |
Deferred compensation liability | 153 | 167
Derivative instruments | 0 | 0
Total | 153 | 167
Level 1 | Money market funds |  |
Assets |  |
Cash equivalents and restricted cash equivalents: | 10,894 | 11,779
Other current and non-current assets: | 4 | 4
Level 1 | Marketable equity securities |  |
Assets |  |
Marketable equity securities | 564 | 490
Level 1 | U.S. government-sponsored debt securities |  |
Assets |  |
Cash equivalents and restricted cash equivalents: | 0 | 0
Investment securities | 0 | 0
Level 1 | U.S. Treasury securities |  |
Assets |  |
Cash equivalents and restricted cash equivalents: | 700 | 2,400
Investment securities | 4,920 | 2,985
Level 1 | Derivative instruments |  |
Assets |  |
Other current and non-current assets: | 0 | 0
Level 2 |  |
Assets |  |
Total | 779 | 755
Liabilities |  |
Deferred compensation liability | 0 | 0
Derivative instruments | 292 | 109
Total | 292 | 109
Level 2 | Money market funds |  |
Assets |  |
Cash equivalents and restricted cash equivalents: | 0 | 0
Other current and non-current assets: | 0 | 0
Level 2 | Marketable equity securities |  |
Assets |  |
Marketable equity securities | 0 | 0
Level 2 | U.S. government-sponsored debt securities |  |
Assets |  |
Cash equivalents and restricted cash equivalents: | 0 | 100
Investment securities | 15 | 245
Level 2 | U.S. Treasury securities |  |
Assets |  |
Cash equivalents and restricted cash equivalents: | 0 | 0
Investment securities | 0 | 0
Level 2 | Derivative instruments |  |
Assets |  |
Other current and non-current assets: | $ 764 | $ 410

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