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Fair Value Measurements - Additional Information (Detail) € in Millions, $ in Millions, ¥ in Billions | Jun. 30, 2017 USD ($) | Jun. 30, 2017 EUR (€) | Sep. 30, 2016 USD ($) | Sep. 30, 2016 EUR (€) | Sep. 30, 2016 JPY (¥)
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Derivative [Line Items] |  |  |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax | $ 5 |  | $ (1) |  |
Fair value of long term debt | 12,600 |  | 15,700 |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair value of long term debt | 8,700 |  | 9,700 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair value of long term debt | $ 3,900 |  | $ 6,000 |  |
Foreign Currency Denominated Debt [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | ¥ |  |  |  |  | ¥ 37
Foreign Currency Denominated Debt [Member] | One billion euro net investment hedge [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | € |  | € 1,000 |  | € 1,000 |
Foreign Currency Denominated Debt [Member] | 500 million euro net investment hedge [Member] [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | € |  | € 485 |  | € 500 |

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