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Derivative Instruments and Hedging Activities - Net Investment Hedges (Detail) - Foreign Currency Denominated Debt [Member] € in Millions, ¥ in Billions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 EUR (€) | Jun. 30, 2021 JPY (¥) | Sep. 30, 2020 EUR (€) | Sep. 30, 2020 JPY (¥)
853 million euro net investment hedge |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | € 853 |  |  |
888 million euro net investment hedge [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount |  |  | € 888 |
500 million euro net investment hedge [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | 500 |  | 500 |
500 million euro net investment hedge #2 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | 500 |  | 500 |
423 million euro net investment hedge [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | 423 |  | 423 |
54 million euro net investment hedge [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | € 54 |  | € 54 |
25 billion yen net investment hedge [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | ¥ |  | ¥ 25 |  | ¥ 25

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