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Derivative Instruments and Hedging Activities - Additional Information (Detail) € in Millions, $ in Millions, ¥ in Billions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2020 EUR (€) | Mar. 31, 2020 JPY (¥) | Mar. 31, 2019 USD ($)
Derivative [Line Items] |  |  |  |  |  |
Gains (losses) reclassified from CTA to income for the Company's outstanding net investment hedges | $ | $ 0 | $ 0 | $ 0 |  |  | $ 0
Foreign Currency Denominated Debt [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | ¥ |  |  |  |  | ¥ 25 |
54 million euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount |  |  |  | € 54 |  |
One billion euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount |  |  |  | 888 |  |
750 million euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount |  |  |  | 750 |  |
423 million euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount |  |  |  | € 423 |  |

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