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Fair Value Measurements and Investments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Sep. 30, 2019
--- | --- | ---
Assets |  |
U.S. securities | $ 3,400 | $ 6,300
Level 1 | Fair Value, Measurements, Recurring |  |
Assets |  |
Marketable equity securities | 121 | 126
Total | 9,190 | 7,295
Liabilities |  |
Deferred compensation liability | 111 | 113
Total | 111 | 113
Level 1 | U.S. Treasury securities | Fair Value, Measurements, Recurring |  |
Assets |  |
U.S. securities | 205 | 675
Level 2 | Fair Value, Measurements, Recurring |  |
Assets |  |
Derivative instruments | 768 | 437
Total | 3,917 | 6,179
Liabilities |  |
Derivative instruments | 272 | 52
Total | 272 | 52
Level 2 | U.S. government-sponsored debt securities | Fair Value, Measurements, Recurring |  |
Assets |  |
U.S. securities | 3,149 | 5,592
Money market funds | Level 1 | Fair Value, Measurements, Recurring |  |
Assets |  |
Cash equivalents and restricted cash equivalents: | 8,864 | 6,494
U.S. government-sponsored debt securities | Level 2 | Fair Value, Measurements, Recurring |  |
Assets |  |
Cash equivalents and restricted cash equivalents: | $ 0 | $ 150

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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