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Fair Value Measurements - Additional Information (Detail) $ in Millions, € in Billions, ¥ in Billions | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2018 EUR (€) | Jun. 30, 2018 JPY (¥) | Sep. 30, 2017 EUR (€) | Sep. 30, 2017 JPY (¥)
Derivative [Line Items] |  |  |  |  |  |
Unrealized gains on marketable common stock | $ 20 | $ 10 |  |  |  |
Unrealized losses on marketable common stock | 18 | 6 |  |  |  |
Proceeds from Sale and Maturity of Marketable Securities | 3 |  |  |  |  |
Marketable Securities, Realized Gain (Loss) | 2 |  |  |  |  |
Fair value of long term debt | 10,400 | 12,700 |  |  |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Fair value of long term debt | 8,700 | 8,600 |  |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Fair value of long term debt | $ 1,700 | $ 4,100 |  |  |  |
Foreign Currency Denominated Debt [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | ¥ |  |  |  | ¥ 35 |  | ¥ 35
Foreign Currency Denominated Debt [Member] | One billion euro net investment hedge [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | € |  |  | € 1 |  | € 1 |

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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 + Details
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- Definition This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27405-111563 + Details
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