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Other Financial Information (Other Assets) (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Sep. 30, 2022
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Pension assets | $ 998 | $ 865
Unbilled receivables (contract assets) | 536 | 428
Operating lease right-of-use assets | 508 | 439
Deferred income taxes | 100 | 85
Asbestos-related insurance receivables | $ 66 | $ 68

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