Retirement Plans Accumulated Benefit Obligations and Reconciliations of Changes in Projected Benefit Obligation, Changes in Plan Assets and Funded Status (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
U.S. Pension Plans
Retirement Plans [Line Items]
Accumulated Benefit Obligation	$ 2,839	$ 3,586
Change in Projected Benefit Obligation
Projected benefit obligation at beginning of year	3,736	2,953
Service cost	90	69	66
Interest cost	151	150	145
Plan participant contributions	0
Acquisitions	0
Divestitures	0
Actuarial (gain) loss	(452)	722
Amendments made during the year	(2)	0
Estimated subsidy received	0	0
Curtailment	0	0
Other	0	0
Currency translation adjustment	0	0
Projected benefit obligation at end of year	2,902	3,736	2,953
Change in Plan Assets
Fair value of plan assets at beginning of year	2,985	2,372
Actual return on plan assets	282	504
Acquisitions	0	0
Divestitures	0	0
Employer and employee contributions	10	267
Benefits paid	(136)	(158)
Settlement payments	(485)	0
Other	0	0
Currency translation adjustment	0	0
Fair value of plan assets at end of year	2,656	2,985	2,372
Funded status	(246)	(751)
Amounts recognized in the statement of financial position consist of:
Prepaid benefit cost	29	3
Accrued benefit liability	(275)	(754)
Net amount recognized	(246)	(751)
Weighted Average Assumptions
Discount rate	4.90%	4.15%
Rate of compensation increase	3.30%	3.25%
Non-U.S. Pension
Retirement Plans [Line Items]
Accumulated Benefit Obligation	1,905	1,904
Change in Projected Benefit Obligation
Projected benefit obligation at beginning of year	2,025	1,852
Service cost	38	41	34
Interest cost	64	73	70
Plan participant contributions	5	6
Acquisitions	2	6
Divestitures	(20)	(2)
Actuarial (gain) loss	84	109
Amendments made during the year	1	(6)
Estimated subsidy received	0	0
Curtailment	(15)	(2)
Other	4	41
Currency translation adjustment	(15)	0
Projected benefit obligation at end of year	1,997	2,025	1,852
Change in Plan Assets
Fair value of plan assets at beginning of year	1,657	1,471
Actual return on plan assets	110	155
Acquisitions	1	0
Divestitures	0	(1)
Employer and employee contributions	85	97
Benefits paid	(64)	(74)
Settlement payments	(112)	(19)
Other	3	16
Currency translation adjustment	(24)	12
Fair value of plan assets at end of year	1,656	1,657	1,471
Funded status	(341)	(368)
Amounts recognized in the statement of financial position consist of:
Prepaid benefit cost	83	61
Accrued benefit liability	(424)	(429)
Net amount recognized	(341)	(368)
Weighted Average Assumptions
Discount rate	3.60%	3.40%
Rate of compensation increase	2.60%	2.40%
Postretirement Benefits
Retirement Plans [Line Items]
Accumulated Benefit Obligation		0
Change in Projected Benefit Obligation
Projected benefit obligation at beginning of year	266	259
Service cost	5	5	5
Interest cost	11	13	13
Plan participant contributions	6	7
Acquisitions		0
Divestitures		0
Actuarial (gain) loss	(21)	7
Amendments made during the year	0
Estimated subsidy received	1	2
Curtailment	0	0
Other	0	2
Currency translation adjustment	(1)	2
Projected benefit obligation at end of year	245	266	259
Change in Plan Assets
Fair value of plan assets at beginning of year	223	156
Actual return on plan assets	12	35
Acquisitions	0	0
Divestitures	0	0
Employer and employee contributions	13	63
Benefits paid	(22)	(31)
Settlement payments	0	0
Other	0	0
Currency translation adjustment	0	0
Fair value of plan assets at end of year	226	223	156
Funded status	(19)	(43)
Amounts recognized in the statement of financial position consist of:
Prepaid benefit cost	51	39
Accrued benefit liability	(70)	(82)
Net amount recognized	(19)	(43)
Weighted Average Assumptions
Discount rate	4.90%	4.15%
Pension and Postretirement Benefits | U.S. Pension Plans
Change in Projected Benefit Obligation
Benefits and settlements paid	(621)	(158)
Pension and Postretirement Benefits | Non-U.S. Pension
Change in Projected Benefit Obligation
Benefits and settlements paid	(176)	(93)
Pension and Postretirement Benefits | Postretirement Benefits
Change in Projected Benefit Obligation
Benefits and settlements paid	$ (22)	$ (31)