Other Financial Data (Other Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Right-of-use assets (Other assets)	$ 489	$ 558
Unbilled Receivables, Current	$ 428	$ 0
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
Other Assets [Member]
Pension assets	$ 881	$ 1,015
Deferred income taxes	85	95
Asbestos-related insurance receivables	$ 99	$ 115