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Derivative and Hedging Instruments - Additional Information (Detail) € in Billions | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2023 EUR (€) | Sep. 30, 2022 EUR (€)
Derivative [Line Items] |  |  |  |  |
Earnings related to forward points and interest differentials from forward contracts and swap agreements | $ (25,000,000) | $ 151,000,000 | $ 156,000,000 |  |
Net unrealized gain (loss) | (126,000,000) | 190,000,000 | 0 |  |
Expected amount of accumulated other comprehensive income (loss) expected to be reclassified | 46,000,000 |  |  |  |
Pre-tax gains (losses) in other comprehensive income (loss) related to net investment hedges | (445,000,000) | 845,000,000 | $ 20,000,000 |  |
Accrued liabilities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Collateral received with counterparties | 91,000,000 |  |  |  |
Other Assets |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Posted collateral | 47,000,000 |  |  |  |
Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | 11,000,000,000 | 11,900,000,000 |  |  |
Designated as Hedging Instrument | Net Investment Hedging |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Hedged liability, fair value hedge | € |  |  |  | € 3.0 | € 1.2
Not Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | $ 800,000,000 | $ 1,500,000,000 |  |  |

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