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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2018
Derivative [Line Items] |  |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) Restricted | $ 21 | $ 0 |
Fair value of long term debt | 9,500 |  | $ 9,600
Fair Value, Inputs, Level 1 [Member] |  |  |
Derivative [Line Items] |  |  |
Fair value of long term debt | 8,500 |  | $ 8,600
Fair Value, Inputs, Level 2 [Member] |  |  |
Derivative [Line Items] |  |  |
Fair value of long term debt | 1,000 |  |
Marketable Securities [Member] |  |  |
Derivative [Line Items] |  |  |
Unrealized Losses on Equity Securities | 22 |  |
Deferred compensation plan assets [Member] |  |  |
Derivative [Line Items] |  |  |
Unrealized Losses on Equity Securities | $ 9 |  |

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