Other Financial Information - Schedule of Accrued Expenses (Details) - USD ($) $ in Millions	Dec. 31, 2023	Sep. 30, 2023
Other Financial Information [Abstract]
Customer advances (contract liabilities)	$ 1,133	$ 861
Employee compensation	499	618
Income taxes	274	207
Operating lease liabilities (current)	157	144
Product warranty	$ 73	$ 84
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued expenses	Accrued expenses