Other (Income) Expense (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Other (Income) Expense - Net [Abstract]
Gain on sale of assets	$ (5)	$ (9)
Net gain on marketable securities transactions		(8)
Other - net	8	(5)
Total other (income) expense - net	$ 3	$ (22)