Retirement Plans (Schedule Of Retirement Plans Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension expense	$ 127	$ 95	$ 153
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Total retirement plans expense	211	181	233
Non-U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Total retirement plans expense	62	86	106
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plans	96	104	111
Non-U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plans	47	56	61
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	60	59	69
Interest cost	134	148	182
Expected return on plan assets	(290)	(296)	(303)
Net amortization and other	211	166	174
Net periodic pension expense	115	77	122
Non-U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	19	26	37
Interest cost	30	39	46
Expected return on plan assets	(56)	(52)	(58)
Net amortization and other	22	17	20
Net periodic pension expense	$ 15	$ 30	$ 45