OTHER FINANCIAL INFORMATION - Schedule of Accrued Expenses (Details) - USD ($) $ in Millions	Dec. 31, 2025	Sep. 30, 2025
Other Financial Information [Abstract]
Customer advances (contract liabilities)	$ 1,088	$ 1,031
Employee compensation	461	740
Income taxes	193	130
Operating lease liabilities (current)	139	138
Product warranty	$ 85	$ 90
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued expenses	Accrued expenses