Financial Instruments and Fair Value Measurements (Details 1) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Derivative and Financial Instruments, Fair Value [Line Items]
Total assets derivatives	$ 59	$ 81
Total liabilities derivatives	6	9
Designated derivative instruments
Derivative Assets	59	78
Derivative Liabilities	6	9
Derivative not designated
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	0	3
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	0	0
Financial Instruments, Owned, at Fair Value [Abstract]
Total other financial instruments	343	308
Marketable securities \| Financial Instruments Recorded In Other Current Assets [Member]
Financial Instruments, Owned, at Fair Value [Abstract]
Marketable Securities Fair Value Disclosure	82	72
Available-for-sale securities \| Financial Instruments Recorded In Other Assets [Member]
Financial Instruments, Owned, at Fair Value [Abstract]
Available-for-sale Securities, Fair Value Disclosure	261	236
Interest Rate Swap Contracts [Member] \| Other Current Assets [Member]
Designated derivative instruments
Derivative Assets	0	2
Interest Rate Swap Contracts [Member] \| Other Assets [Member]
Designated derivative instruments
Derivative Assets	38	40
Interest Rate Swap Contracts [Member] \| Other Accruals [Member]
Designated derivative instruments
Derivative Liabilities	0	0
Interest Rate Swap Contracts [Member] \| Other Liabilities [Member]
Designated derivative instruments
Derivative Liabilities	0	2
Foreign Currency Contracts [Member] \| Other Current Assets [Member]
Designated derivative instruments
Derivative Assets	11	8
Foreign Currency Contracts [Member] \| Other Assets [Member]
Designated derivative instruments
Derivative Assets	8	28
Derivative not designated
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	0	3
Foreign Currency Contracts [Member] \| Other Accruals [Member]
Designated derivative instruments
Derivative Liabilities	6	6
Derivative not designated
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	0	0
Foreign Currency Contracts [Member] \| Other Liabilities [Member]
Designated derivative instruments
Derivative Liabilities	0	0
Commodity Contracts [Member] \| Other Current Assets [Member]
Designated derivative instruments
Derivative Assets	2	0
Commodity Contracts [Member] \| Other Accruals [Member]
Designated derivative instruments
Derivative Liabilities	$ 0	$ 1

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This element represents the portion of the balance sheet valued at fair value by the entity for marketable security investments.

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No definition available.

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- Definition

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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Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset.

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Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability.

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Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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