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Derivative and Hedging Instruments - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Derivative [Line Items] |  |  |
Earnings related to forward points and interest differentials from forward contracts and swap agreements | $ (94) | $ (25) | $ 151
Net unrealized gain (loss) | (38) | (126) | 917
Net unrealized gain (loss) |  |  | 190
Pre-tax gains (losses) in other comprehensive income (loss) related to net investment hedges | (321) | (445) | $ 845
Accumulated other comprehensive income (loss) | (308) | (1,317) |
Accrued liabilities |  |  |
Derivative [Line Items] |  |  |
Collateral received with counterparties | 62 |  |
Other Assets |  |  |
Derivative [Line Items] |  |  |
Posted collateral | 48 |  |
Net Investment Hedging |  |  |
Derivative [Line Items] |  |  |
Accumulated other comprehensive income (loss) | 182 | 433 |
Designated as Hedging Instruments: |  |  |
Derivative [Line Items] |  |  |
Notional amount | 11,700 | 11,000 |
Not Designated as Hedging Instruments: |  |  |
Derivative [Line Items] |  |  |
Notional amount | $ 1,900 | $ 800 |

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