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Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Investment securities |  |
Trading | $ 82 | $ 71
Available-for-sale securities | 5,408 | 7,179
Fair Value, Measurements, Recurring | Level 1 |  |
Investment securities |  |
Fair value, total assets | 7,762 | 6,839
Liabilities |  |
Fair value, total liabilities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Money market funds |  |
Cash equivalents and restricted cash |  |
Cash equivalents and restricted cash | 5,935 | 4,537
Fair Value, Measurements, Recurring | Level 1 | Equity securities |  |
Investment securities |  |
Trading | 82 | 71
Available-for-sale securities | 124 | 53
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury securities |  |
Investment securities |  |
Available-for-sale securities | 1,621 | 2,178
Fair Value, Measurements, Recurring | Level 2 |  |
Investment securities |  |
Fair value, total assets | 6,551 | 5,200
Liabilities |  |
Fair value, total liabilities | 98 | 136
Fair Value, Measurements, Recurring | Level 2 | U.S. government-sponsored debt securities |  |
Cash equivalents and restricted cash |  |
Cash equivalents and restricted cash | 2,870 | 196
Investment securities |  |
Available-for-sale securities | 3,663 | 4,699
Fair Value, Measurements, Recurring | Level 2 | Corporate debt securities |  |
Investment securities |  |
Available-for-sale securities | 0 | 249
Prepaid and other current assets | Fair Value, Measurements, Recurring | Level 2 | Foreign exchange derivative instruments |  |
Investment securities |  |
Foreign exchange derivative instruments | 18 | 50
Other Assets | Fair Value, Measurements, Recurring | Level 2 | Foreign exchange derivative instruments |  |
Investment securities |  |
Foreign exchange derivative instruments |  | 6
Accrued Liabilities | Fair Value, Measurements, Recurring | Level 2 | Foreign exchange derivative instruments |  |
Liabilities |  |
Foreign exchange derivative instruments | 98 | 116
Other Liabilities | Fair Value, Measurements, Recurring | Level 2 | Foreign exchange derivative instruments |  |
Liabilities |  |
Foreign exchange derivative instruments | $ 0 | $ 20

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + 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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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 + Details
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