Fair Value Measurements and Financial Instruments (Details 4) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Jun. 30, 2013	Jun. 30, 2013 Bonds Issued By Venezuelan Government [Member]	Dec. 31, 2012 Bonds Issued By Venezuelan Government [Member]	Jun. 30, 2012 Bonds Issued By Venezuelan Government [Member]	Dec. 31, 2010 Bonds Issued By Venezuelan Government [Member]	Jun. 30, 2013 Other Current Assets [Member]	Dec. 31, 2012 Other Current Assets [Member]	Jun. 30, 2013 Other Current Assets [Member] Fair Value Inputs Level1	Jun. 30, 2013 Other Current Assets [Member] Bonds Issued By Venezuelan Government [Member]	Jun. 30, 2013 Other Assets [Member] Available for Sale Securities	Dec. 31, 2012 Other Assets [Member] Available for Sale Securities
Schedule of Available-for-sale Securities [Line Items]
Marketable Securities							$ 174	$ 116	$ 150	$ 24
Available-for-sale Securities			611	642	392	236					587	618
Fair Value of U.S. dollar-linked, devaluation-protected bonds		257
Fair Value of fixed interest rate bonds		354
One-time loss related to the remeasurement of fixed interest rate bonds in Venezuela	$ 133