Contingencies (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Jun. 30, 2013		Sep. 30, 2012
Discounted Amount Environmental Accrual For Onging Operations Maintenance and Monitoring	$ 10
Payments and other	(5)
Accruals(1)	8	[1]
Balance at December 31, 2012	20		17
Undiscounted Amount Environmental Accrual For Onging Operations Maintenance and Monitoring	11
Super Fund [Member]
Number of Superfund Environmental Sites	9
Payments and other	(1)
Accruals(1)	1	[1]
Balance at December 31, 2012	2		2
Environmental Costs Reasonably Possible	19
Non-Super Fund [Member]
Payments and other	(4)
Accruals(1)	7	[1]
Balance at December 31, 2012	18		15
Environmental Costs Reasonably Possible	43
Discontinued Operations [Member]
Environmental Remediation Expense	$ 6

[1] Includes $6 million recognized in loss from discontinued operations in the consolidated statement of operations.