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Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Sep. 30, 2025
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Loss | The following summary sets forth the changes in the components of accumulated other comprehensive loss, net of a related tax cost of less than $1 million.
| Foreign Currency Translation Gains (Losses) (a) |  | Minimum Pension Liability Adjustment |  | Deferred Gains (Losses) On Derivative Financial Instruments |  | Accumulated Other Comprehensive Loss, net
| (in millions)
Balances at September 30, 2022 | $ | (358) |  |  | $ | (2) |  |  | $ | 13 |  |  | $ | (347) |
Other comprehensive income | 36 |  |  | 1 |  |  | (12) |  |  | 25 |
Balances at September 30, 2023 | $ | (322) |  |  | $ | (1) |  |  | $ | 1 |  |  | $ | (322) |
Other comprehensive income | 78 |  |  | (2) |  |  | (1) |  |  | 75 |
Balances at September 30, 2024 | $ | (244) |  |  | $ | (3) |  |  | $ | — |  |  | $ | (247) |
Other comprehensive income | 56 |  |  | 2 |  |  | — |  |  | 58 |
Balances at September 30, 2025 | $ | (188) |  |  | $ | (1) |  |  | $ | — |  |  | $ | (189) |
______________________________________ (a)Includes historical foreign currency translation related to certain intra-entity transactions.

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