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Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Derivative [Line Items] |  |  |  |
Other comprehensive income (loss) |  | $ 10,000,000 | $ (14,000,000) | $ 16,000,000
Pre-tax net losses associated with interest rate hedges |  | 10,000,000 |  |
Pre-tax (losses) gains associated with net investment hedges |  | (42,000,000) | (39,000,000) | $ (57,000,000)
Maximum amount of loss |  | 97,000,000 |  |
Cash collateral received |  | $ 2,000,000 | 14,000,000 |
Energy Services |  |  |  |
Derivative [Line Items] |  |  |  |
Fixed rate (as a percentage) |  | 3.549% |  |
IRPA |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, notional amount |  | $ 0 | $ 0 |
Foreign Exchange Forward |  |  |  |
Derivative [Line Items] |  |  |  |
Potential exposure coverage, percent (as a percentage) |  | 90.00% |  |
Revolver | Line of Credit |  |  |  |
Derivative [Line Items] |  |  |  |
Other comprehensive income (loss) | $ 32,000,000 |  |  |

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