Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2012		Sep. 30, 2012
Discounted Amount Environmental Accrual For Onging Operations Maintenance and Monitoring	$ 10
Number of Superfund Environmental Sites	9
Payments and other	(2)
Accruals(1)	6	[1]
Balance at December 31, 2012	21		17
Undiscounted Amount Environmental Accrual For Onging Operations Maintenance and Monitoring	11
Super Fund [Member]
Payments and other	0
Accruals(1)	1
Balance at December 31, 2012	3		2
Environmental Costs Reasonably Possible	19
Non-Super Fund [Member]
Payments and other	(2)
Accruals(1)	5	[1]
Balance at December 31, 2012	18		15
Environmental Costs Reasonably Possible	43
Discontinued Operations [Member]
Environmental Remediation Expense	$ 5

[1] Includes $5 million recognized in loss from discontinued operations in the consolidated statement of operations.