Restructuring (Recorded Restructuring Activities) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, period expense	$ 9	$ 7	$ 12	$ 11
Cost Of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, period expense	9	7	11	10
Selling And Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, period expense			$ 1	$ 1