Leases Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Right-of-use assets (Other assets)	$ 489	$ 558
Current lease liabilities (Accrued expenses)	144	155
Noncurrent lease liabilities (Other liabilities)	$ 348	$ 413
Operating leases, weighted-average remaining term	5 years 8 months 12 days	5 years 9 months 18 days
Operating leases, weighted-average discount rate	3.00%	2.60%
Current lease liabilities (accrued expenses)[Extensible Enumeration]	Accrued expenses	Accrued expenses
Noncurrent lease liabilities (other liabilities) [Extensible Enumeration]	Other liabilities	Other liabilities
Right-of-Use Asset (other assets) [Extensible Enumeration]	Assets, Noncurrent, Other than Noncurrent Investments and Property, Plant and Equipment	Assets, Noncurrent, Other than Noncurrent Investments and Property, Plant and Equipment