Restructuring (Restructuring Activities And Related Reserves) (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]
Reserve at beginning of period	$ 10		$ 11
Charges	9	7	12	11
Costs charged against assets/liabilities	(5)		(7)
Proceeds from sale	1		1
Cash paid	(4)		(6)
Reserve at end of period	11		11
Severance And Employee Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Reserve at beginning of period	8		9
Charges	2		2
Costs charged against assets/liabilities	(1)		(1)
Cash paid	(2)		(3)
Reserve at end of period	7		7
Environmental Remediation [Member]
Restructuring Cost and Reserve [Line Items]
Charges	3		3
Cash paid	(1)		(1)
Reserve at end of period	2		2
Asset Impairment And Accelerated Depreciation [Member]
Restructuring Cost and Reserve [Line Items]
Charges	3		5
Costs charged against assets/liabilities	(3)		(5)
Asset Sales [Member]
Restructuring Cost and Reserve [Line Items]
Costs charged against assets/liabilities	(1)		(1)
Proceeds from sale	1		1
Other [Member]
Restructuring Cost and Reserve [Line Items]
Reserve at beginning of period	2		2
Charges	1		2
Cash paid	(1)		(2)
Reserve at end of period	$ 2		$ 2