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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Sep. 30, 2018
Derivative [Line Items] |  |  |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) Restricted | $ 20 | $ 0 | $ (1) |
Fair value of long term debt | 9,600 |  | 9,600 | $ 9,600
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Fair value of long term debt | 8,600 |  | 8,600 | 8,600
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Fair value of long term debt | 1,000 |  | 1,000 | $ 1,000
Marketable Securities [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) | 21 |  | (1) |
Deferred compensation plan assets [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) | $ 7 |  | $ (2) |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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- Definition Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117546-209714 + Details
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