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Derivative and Hedging Instruments - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Derivative [Line Items] |  |  |
Increase (decrease) related to forward points and interest differentials from forward contracts and swap agreements | $ (45) | $ (94) | $ (25)
Net unrealized gain (loss) | (172) | (38) | (126)
Pre-tax gains (losses) to be reclassified from AOCI into the statement of operations | (157) |  |
Pre-tax gains (losses) in other comprehensive income (loss) related to net investment hedges | (459) | (321) | $ (445)
Accumulated other comprehensive income (loss) | 248 | (308) |
Accrued liabilities |  |  |
Derivative [Line Items] |  |  |
Collateral received with counterparties | 45 |  |
Other Assets |  |  |
Derivative [Line Items] |  |  |
Posted collateral | 192 |  |
Net Investment Hedging |  |  |
Derivative [Line Items] |  |  |
Accumulated other comprehensive income (loss) | $ (176) | $ 182 |

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