Fair Value Measurements and Financial Instruments (Details 5) (Fair Value, Inputs, Level 2 [Member], Bonds Issued By Venezuelan Government [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member] | Bonds Issued By Venezuelan Government [Member]
Venezuelan Investments [Roll Forward]
Beginning balance	$ 685	$ 642
Unrealized gain (loss) on investment	(341)	(113)
Purchases and sales during the period	55	156
Ending balance	$ 399	$ 685