OTHER FINANCIAL DATA - Schedule of Other Assets (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024
Other Financial Data [Abstract]
Pension assets	$ 1,229	$ 1,194
Operating lease right-of-use assets	637	692
Unbilled receivables (contract assets)	621	519
Deferred income taxes	79	64
Asbestos-related insurance receivables	$ 55	$ 37
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