Retirement Plans (Schedule Of Retirement Plans Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension expense	$ 95	$ 153	$ 142
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Total retirement plans expense	181	233	227
Non-U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Total retirement plans expense	86	106	104
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plans	104	111	119
Non-U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plans	56	61	59
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	59	69	59
Interest cost	148	182	182
Expected return on plan assets	(296)	(303)	(286)
Net amortization and other	166	174	153
Net periodic pension expense	77	122	108
Non-U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	26	37	32
Interest cost	39	46	53
Expected return on plan assets	(52)	(58)	(58)
Net amortization and other	17	20	18
Net periodic pension expense	$ 30	$ 45	$ 45