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Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2023 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Sep. 30, 2024
Derivative [Line Items] |  |  |  |  |  |
Net gains (losses) on derivative instruments |  | $ (2,000,000) | $ 4,000,000 | $ 9,000,000 | $ 1,000,000 |
Pre-tax gains (losses) associated with net investment hedges |  | (68,000,000) | 6,000,000 | (46,000,000) | (9,000,000) |
Maximum amount of loss |  | 114,000,000 |  | 114,000,000 |  |
Cash collateral received |  | 21,000,000 | 12,000,000 | 21,000,000 | 12,000,000 | $ 14,000,000
Revolver | Credit Agreement |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Net gains (losses) on derivative instruments | $ 32,000,000 |  |  |  |  |
IRPAs |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount |  | 0 | $ 0 | 0 | $ 0 | $ 0
Pre-tax net gains associated with interest rate hedges |  | $ 9,000,000 |  | $ 9,000,000 |  |
Forward foreign currency exchange contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative notional amount percent of required need coverage |  | 90.00% |  | 90.00% |  |
Energy Services |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Borrowings interest rate |  | 3.549% |  | 3.549% |  |

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