Fair Value Measurements and Financial Instruments (Details 5) (Bonds Issued By Venezuelan Government [Member], USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2010
Bonds Issued By Venezuelan Government [Member]
Venezuelan Investments [Roll Forward]
Beginning balance	$ 642		$ 236
Unrealized gain (loss) on investment	(124)	14
Purchases and sales during the period	182	373
Ending balance	$ 700	$ 623	$ 236