Income Taxes (Details) (USD $) In Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2010	Mar. 31, 2010	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Significant components of the Company's income tax provision
Tax expense (benefit) at federal statutory rate			$ 739	$ 617	$ (111)
State income taxes, net of federal benefit			(10)	28	(15)
Foreign income tax expense at different rates and foreign losses without tax benefits			(351)	(330)	(92)
U.S. tax on foreign income			28	(3)	81
Reserve and valuation allowance adjustments			(30)	(138)	180
Medicare Part D	(2)	18		16
Credits			(7)	(3)	(11)
Other			1	10
Provision for income taxes			370	197	32
Reconciliation of the beginning and ending amount of unrecognized tax benefits
Beginning balance, September 30			1,262	1,049	814
Additions for tax positions related to the current year			150	253	236
Additions for tax positions of prior years			20	257	65
Reductions for tax positions of prior years			(62)	(158)	(29)
Settlements			(5)	(109)	(37)
Statute closings			(8)	(30)
Ending balance, September 30	1,262		1,357	1,262	1,049
Current
Federal			56	112	53
State				29	6
Foreign			458	141	(33)
Total			514	282	26
Deferred
Federal			208	106	(159)
State			(9)	2	(11)
Foreign			(343)	(193)	176
Total			(144)	(85)	6
Provision for income taxes			370	197	32
Deferred taxes classified in consolidated statements of financial position
Other current assets	533		558	533
Other noncurrent assets	1,436		1,855	1,436
Other current liabilities	(1)		(4)	(1)
Other noncurrent liabilities	(112)		(56)	(112)
Net deferred tax asset	1,856		2,353	1,856
Deferred tax assets
Accrued expenses and reserves	821		793	821
Employee and retiree benefits	333		390	333
Net operating loss and other credit carryforwards	1,731		2,314	1,731
Research and development	128		103	128
Gross deferred tax assets	3,013		3,600	3,013
Valuation allowances	(739)		(719)	(739)
Net deferred tax assets	2,274		2,881	2,274
Deferred tax liabilities
Property, plant and equipment	40		130	40
Intangible assets	330		345	330
Other	48		53	48
Total deferred tax liabilities	418		528	418
Net deferred tax asset	$ 1,856		$ 2,353	$ 1,856
Austria [Member]
Statute of limitations by major tax jurisdictions
Statute of limitations by major tax jurisdictions			5 years
Tax jurisdictions and years currently under audit exam
Tax jurisdictions and years currently under audit exam			2006-2008
Belgium [Member]
Statute of limitations by major tax jurisdictions
Statute of limitations by major tax jurisdictions			3 years
Brazil [Member]
Statute of limitations by major tax jurisdictions
Statute of limitations by major tax jurisdictions			5 years
Tax jurisdictions and years currently under audit exam
Tax jurisdictions and years currently under audit exam			2005 - 2008
Canada [Member]
Statute of limitations by major tax jurisdictions
Statute of limitations by major tax jurisdictions			5 years
Tax jurisdictions and years currently under audit exam
Tax jurisdictions and years currently under audit exam			2007 - 2008
China [Member]
Statute of limitations by major tax jurisdictions
Statute of limitations by major tax jurisdictions			3 to 5 years
Czech Republic [Member]
Statute of limitations by major tax jurisdictions
Statute of limitations by major tax jurisdictions			3 years
Tax jurisdictions and years currently under audit exam
Tax jurisdictions and years currently under audit exam			2007 - 2009
France [Member]
Statute of limitations by major tax jurisdictions
Statute of limitations by major tax jurisdictions			3 years
Tax jurisdictions and years currently under audit exam
Tax jurisdictions and years currently under audit exam			2002-2010
Germany [Member]
Statute of limitations by major tax jurisdictions
Statute of limitations by major tax jurisdictions			4 to 5 years
Tax jurisdictions and years currently under audit exam
Tax jurisdictions and years currently under audit exam			2001-2009
Italy [Member]
Statute of limitations by major tax jurisdictions
Statute of limitations by major tax jurisdictions			4 years
Tax jurisdictions and years currently under audit exam
Tax jurisdictions and years currently under audit exam			2005 - 2009
Japan [Member]
Statute of limitations by major tax jurisdictions
Statute of limitations by major tax jurisdictions			5 to 7 years
Mexico [Member]
Statute of limitations by major tax jurisdictions
Statute of limitations by major tax jurisdictions			5 years
Tax jurisdictions and years currently under audit exam
Tax jurisdictions and years currently under audit exam			2003 - 2004
Poland [Member]
Statute of limitations by major tax jurisdictions
Statute of limitations by major tax jurisdictions			5 years
Tax jurisdictions and years currently under audit exam
Tax jurisdictions and years currently under audit exam			2007 - 2008
Spain [Member]
Statute of limitations by major tax jurisdictions
Statute of limitations by major tax jurisdictions			4 years
Tax jurisdictions and years currently under audit exam
Tax jurisdictions and years currently under audit exam			2006 - 2008
United Kingdom [Member]
Statute of limitations by major tax jurisdictions
Statute of limitations by major tax jurisdictions			4 years
United States - Federal [Member]
Statute of limitations by major tax jurisdictions
Statute of limitations by major tax jurisdictions			3 years
United States - State [Member]
Statute of limitations by major tax jurisdictions
Statute of limitations by major tax jurisdictions			3 to 5 years