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

Lessee, Operating Lease, Lease Not yet Commenced, Number of Contracts

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Lessee, Operating Lease, Lease Not yet Commenced, Undiscounted Future Minimum Payments

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Other Financial Information

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income.

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of lessee's right to use underlying asset under operating lease.

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Carrying amount as of the balance sheet date of known and reasonably estimable amounts of recoveries from third-parties pertaining to an entity's environmental remediation obligations. An entity's balance sheet may include several assets that relate to an environmental remediation obligation. Among them are the following: a. Receivables from other potentially responsible parties that are not providing initial funding; b. anticipated recoveries from insurers; and c. anticipated recoveries from prior owners as a result of indemnification agreements.

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Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

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