OTHER FINANCIAL DATA - Other Assets (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Other Financial Data [Abstract]
Pension assets	$ 1,194	$ 995
Operating lease right-of-use assets	692	550
Unbilled receivables (contract assets)	519	559
Deferred income taxes	64	100
Asbestos-related insurance receivables	$ 37	$ 53
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Assets, Noncurrent, Other than Noncurrent Investments and Property, Plant and Equipment	Assets, Noncurrent, Other than Noncurrent Investments and Property, Plant and Equipment