Retirement Plans (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Change in Plan Assets
Fair value of plan assets at end of year		$ 0	$ 0
U.S. Pension Plans [Member]
ABO and reconciliations of the changes in the PBO, the changes in plan assets and the funded status
Accumulated Benefit Obligation	2,850	2,655
Change in Projected Benefit Obligation
Projected benefit obligation at beginning of year	2,717	2,512
Service cost	66	67	66
Interest cost	145	152	159
Actuarial loss	177	106
Benefits paid	(150)	(120)
Settlement	(2)
Projected benefit obligation at end of year	2,953	2,717	2,512
Change in Plan Assets
Fair value of plan assets at beginning of year	2,471	1,867
Actual return on plan assets	44	151
Employer and employee contributions	9	573
Benefits paid	(150)	(120)
Settlement payments	(2)
Fair value of plan assets at end of year	2,372	2,471	1,867
Funded status	(581)	(246)
Amounts recognized in the statement of financial position consist of:
Prepaid benefit cost	0	7
Accrued benefit liability	(581)	(253)
Net amount recognized	(581)	(246)
Weighted Average Assumptions
Discount rate	5.25%	5.50%
Rate of compensation increase	3.30%	3.20%
Non-U.S. Pension Plans [Member]
ABO and reconciliations of the changes in the PBO, the changes in plan assets and the funded status
Accumulated Benefit Obligation	1,774	1,622
Change in Projected Benefit Obligation
Projected benefit obligation at beginning of year	1,725	1,521
Service cost	34	38	32
Interest cost	70	68	65
Plan participant contributions	6	5
Acquisitions	76	1
Actuarial loss	9	146
Amendments made during the year	(32)	(3)
Benefits paid	(67)	(68)
Curtailment gain	(30)	(5)
Settlement	(12)
Other	40	6
Currency translation adjustment	33	16
Projected benefit obligation at end of year	1,852	1,725	1,521
Change in Plan Assets
Fair value of plan assets at beginning of year	1,216	1,080
Actual return on plan assets	29	64
Acquisitions	12
Employer and employee contributions	271	108
Benefits paid	(67)	(68)
Settlement payments	(12)
Other	1	4
Currency translation adjustment	21	28
Fair value of plan assets at end of year	1,471	1,216	1,080
Funded status	(381)	(509)
Amounts recognized in the statement of financial position consist of:
Prepaid benefit cost	40	17
Accrued benefit liability	(421)	(526)
Net amount recognized	(381)	(509)
Weighted Average Assumptions
Discount rate	4.00%	4.00%
Rate of compensation increase	2.50%	3.00%
Postretirement Health and Other Benefits [Member]
ABO and reconciliations of the changes in the PBO, the changes in plan assets and the funded status
Accumulated Benefit Obligation	0	0
Change in Projected Benefit Obligation
Projected benefit obligation at beginning of year	256	275
Service cost	5	4	4
Interest cost	13	14	18
Plan participant contributions	6	7
Actuarial loss	5	23
Amendments made during the year		(44)
Benefits paid	(27)	(26)
Estimated subsidy received	1	2
Currency translation adjustment		1
Projected benefit obligation at end of year	259	256	275
Change in Plan Assets
Fair value of plan assets at beginning of year	0	0
Employer and employee contributions	183	26
Benefits paid	(27)	(26)
Fair value of plan assets at end of year	156	0	0
Funded status	(103)	(256)
Amounts recognized in the statement of financial position consist of:
Prepaid benefit cost	15	0
Accrued benefit liability	(118)	(256)
Net amount recognized	$ (103)	$ (256)
Weighted Average Assumptions
Discount rate	5.25%	5.50%