Retirement Plans (Schedule Of Retirement Plans Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension expense	$ 2	$ 28	$ 67
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	25	29	30
Interest cost	33	32	30
Expected return on plan assets	(56)	(74)	(72)
Net amortization and other	3	14	17
Net periodic pension expense	5	1	5
Defined contribution plans	52	52	56
Total retirement plans expense	57	53	61
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	49	54	57
Interest cost	99	94	125
Expected return on plan assets	(253)	(264)	(268)
Net amortization and other	102	143	148
Net periodic pension expense	(3)	27	62
Defined contribution plans	124	114	112
Total retirement plans expense	$ 121	$ 141	$ 174