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Fair Value Measurements - Additional Information (Detail) $ in Millions, € in Billions, ¥ in Billions | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) | Sep. 30, 2017 USD ($) | Mar. 31, 2018 EUR (€) | Mar. 31, 2018 JPY (¥) | Sep. 30, 2017 EUR (€) | Sep. 30, 2017 JPY (¥)
Derivative [Line Items] |  |  |  |  |  |
Unrealized gains on marketable common stock | $ 15 | $ 10 |  |  |  |
Unrealized losses on marketable common stock | 13 | 6 |  |  |  |
Fair value of long term debt | 11,200 | 12,700 |  |  |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Fair value of long term debt | 9,100 | 8,600 |  |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Fair value of long term debt | $ 2,100 | $ 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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