Retirement Plans (Reconciliations Of Actuarial Present Value Of Projected Benefit Obligations And Fair Value Of Plan Assets For Defined Benefit Pension Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Change in fair value of plan assets [Roll Forward]
Fair value of plan assets, beginning	$ 4,863
Fair value of plan assets, ending	5,019	$ 4,863
Noncurrent liability	(844)	(543)
U.S. Plans [Member]
Change in projected benefit obligation [Roll Forward]
Projected benefit obligation, beginning	4,263	4,336
Service cost	59	69	$ 59
Interest cost	148	182	182
Actuarial (gain) loss	565	137
Benefits paid	(191)	(181)
Settlements	(151)	(205)
Acquisitions (Divestitures), net	0	(70)
Foreign currency translation and other	3	(5)
Projected benefit obligation, ending	4,696	4,263	4,336
Change in fair value of plan assets [Roll Forward]
Fair value of plan assets, beginning	3,928	4,473
Actual return on plan assets	491	(137)
Employer contributions	31	20
Benefits paid	(191)	(181)
Settlements	(151)	(205)
Acquisitions (Divestitures), net	0	(44)
Foreign currency translation and other	2	2
Fair value of plan assets, ending	4,110	3,928	4,473
Net amount recognized in the balance sheet	(586)	(335)
Noncurrent asset	0	0
Current liability	(11)	(11)
Noncurrent liability	(565)	(316)
Pretax accumulated other comprehensive loss	(1,527)	(1,322)
Non-U.S. Plans [Member]
Change in projected benefit obligation [Roll Forward]
Projected benefit obligation, beginning	1,248	1,330
Service cost	26	37	32
Interest cost	39	46	53
Actuarial (gain) loss	275	44
Benefits paid	(31)	(36)
Settlements	(82)	(25)
Acquisitions (Divestitures), net	(6)	(4)
Foreign currency translation and other	(149)	(144)
Projected benefit obligation, ending	1,320	1,248	1,330
Change in fair value of plan assets [Roll Forward]
Fair value of plan assets, beginning	935	988
Actual return on plan assets	155	49
Employer contributions	35	33
Benefits paid	(31)	(36)
Settlements	(82)	(25)
Acquisitions (Divestitures), net	0	(2)
Foreign currency translation and other	(103)	(72)
Fair value of plan assets, ending	909	935	$ 988
Net amount recognized in the balance sheet	(411)	(313)
Noncurrent asset	1	30
Current liability	(7)	(6)
Noncurrent liability	(279)	(227)
Pretax accumulated other comprehensive loss	(389)	(306)
Discontinued Operations, Held-for-sale [Member] | U.S. Plans [Member]
Change in fair value of plan assets [Roll Forward]
Net liability held-for-sale	(10)	(8)
Discontinued Operations, Held-for-sale [Member] | Non-U.S. Plans [Member]
Change in fair value of plan assets [Roll Forward]
Net liability held-for-sale	$ (126)	$ (110)