Retirement Plans (Schedule Of Retirement Plans Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension expense	$ 49	$ 127	$ 95
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Total retirement plans expense	171	211	181
Non-U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Total retirement plans expense	62	62	86
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	24	19	26
Interest cost	39	30	39
Expected return on plan assets	(67)	(56)	(52)
Net amortization and other	14	22	17
Net periodic pension expense	10	15	30
Defined contribution plans	52	47	56
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	52	60	59
Interest cost	141	134	148
Expected return on plan assets	(283)	(290)	(296)
Net amortization and other	129	211	166
Net periodic pension expense	39	115	77
Defined contribution plans	$ 132	$ 96	$ 104