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OTHER FINANCIAL INFORMATION - Schedule of Other Assets (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Sep. 30, 2024
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Other Financial Information [Abstract] |  |
Pension assets | $ 1,257 | $ 1,194
Operating lease right-of-use assets | 638 | 692
Unbilled receivables (contract assets) | 579 | 519
Deferred income taxes | $ 55 | $ 64

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