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Other Financial Information - Schedule of Other Assets (Details) $ in Millions | Dec. 31, 2023 USD ($) operating_lease | Sep. 30, 2023 USD ($)
--- | --- | ---
Other Financial Information [Abstract] |  |
Pension assets | $ 1,024 | $ 995
Operating lease right-of-use assets | 635 | 550
Unbilled receivables (contract assets) | 606 | 559
Deferred income taxes | 98 | 100
Asbestos-related insurance receivables | $ 50 | $ 53
Lessee, operating lease, lease not yet commenced, number of contracts | operating_lease | 1 |
Lessee, operating lease, lease not yet commenced, term of contract | 15 years |
Lessee, operating lease, lease not yet commenced, undiscounted future minimum payments | $ 80 |

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