This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

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Fair Value Measurements and Financial Instruments (Details 4) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2013 Bonds Issued By Venezuelan Government [Member]	Mar. 31, 2012 Bonds Issued By Venezuelan Government [Member]	Dec. 31, 2010 Bonds Issued By Venezuelan Government [Member]	Mar. 31, 2013 Other Current Assets [Member]	Dec. 31, 2012 Other Current Assets [Member]	Mar. 31, 2013 Other Current Assets [Member] Fair Value Inputs Level1 [Member]	Mar. 31, 2013 Other Current Assets [Member] Venezuelan government bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable Securities					$ 164	$ 116	$ 140	$ 24
Fair Value of U.S. dollar-linked, devaluation-protected bonds	254
Fair Value of fixed interest rate bonds	344
One-time loss related to the remeasurement of fixed interest rate bonds in Venezuela	133
Venezuelan Investments [Roll Forward]
Beginning balance		642		236
Unrealized gain (loss) on investment		(141)	16
Purchases and sales during the period		97	9
Ending balance		$ 598	$ 261	$ 236