Restructuring (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended		6 Months Ended		1 Months Ended	6 Months Ended		12 Months Ended	6 Months Ended			12 Months Ended	6 Months Ended
	Mar. 31, 2012	Sep. 30, 2011	Dec. 31, 2011	Mar. 31, 2012 Closure Of Hong Kong [Member]	Mar. 31, 2012 Closure Of Hong Kong [Member] Other Post-Closing Costs [Member]	Feb. 28, 2011 Closure Of Grigno [Member]	Mar. 31, 2012 Closure Of Grigno [Member]	Mar. 31, 2012 Closure Of Thane [Member]	Sep. 30, 2010 Closure Of Thane [Member]	Mar. 31, 2012 Closure Of Thane [Member] Demolition And Site Clearing Costs [Member]	Mar. 31, 2012 Closure Of Thane [Member] Other Post-Closing Costs [Member]	Mar. 31, 2012 2009 Global Restructuring [Member]	Sep. 30, 2009 2009 Global Restructuring [Member]	Mar. 31, 2012 2009 Global Restructuring [Member] Demolition And Site Clearing Costs [Member]	Mar. 31, 2012 2009 Global Restructuring [Member] Other Post-Closing Costs [Member]	Mar. 31, 2012 Maximum [Member]	Mar. 31, 2012 Maximum [Member] Closure Of Thane [Member]
Restructuring Cost and Reserve [Line Items]
Affected employees				64		37			120			400
Restructuring charges		$ 5			$ 3		$ 6	$ 23		$ 3	$ 2			$ 7	$ 16
Severance costs	1			2			3	7				55
Restructuring accelerated depreciation and asset impairments							3	12				45
Cash payments							1	8				71
Expected cash outlays beyond fiscal year				2			2
Restructuring costs in accrued expenses	11	11	10				1	1				3
Severance cost payments expected in current year	4
Severance cost payments expected next year																1
Accrued severance costs	2
Pre-tax charge to earnings				10				23				123
Number of facilities closed													3
Expected cumulative net cash outlays related to plan				5				8				72
Expected cash outlays remainder fiscal year				3								1					1
Net gain on sales of non-manufacturing related assets								1
Restructuring accelerated depreciation and severance charges				$ 4