Other Financial Data - Accrued Expenses (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Accrued Expenses [Line Items]
Customer advances (contract liabilities)	$ 897	$ 776
Operating lease liabilities (current)	$ 144	$ 128
Current lease liabilities (accrued expenses)[Extensible Enumeration]	Accrued expenses	Accrued expenses
Other Current Liabilities
Accrued Expenses [Line Items]
Customer advances (contract liabilities)	$ 861	$ 751
Employee compensation	618	523
Product warranty	$ 84	$ 84