Financial Instruments and Fair Value Measurements (Details 1) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Derivative Instruments [Abstract]
Designated asset derivative instruments	$ 53	$ 36
Asset derivatives not designated	2	0
Total asset derivatives	55	36
Designated liability derivative instruments	11	17
Liability derivatives not designated	0	2
Total liability derivatives	11	19
Fair Value, Inputs, Level 1 [Member] \| Financial Instruments Recorded In Other Current Assets [Member]
Financial Instruments [Abstract]
Marketable securities	72	74
Fair Value [Member]
Financial Instruments [Abstract]
Total other financial instruments	305	302
Fair Value [Member] \| Financial Instruments Recorded In Other Assets [Member]
Financial Instruments [Abstract]
Available-for-sale securities	233	228
Interest Rate Swap Contracts [Member] \| Other current assets and Other assets [Member]
Derivative Instruments [Abstract]
Designated asset derivative instruments	45
Interest Rate Swap Contracts [Member] \| Other Assets [Member]
Derivative Instruments [Abstract]
Designated asset derivative instruments		22
Interest Rate Swap Contracts [Member] \| Other Liabilities [Member]
Derivative Instruments [Abstract]
Designated liability derivative instruments	0	7
Foreign Currency Contracts [Member] \| Other Assets [Member]
Derivative Instruments [Abstract]
Asset derivatives not designated	2	0
Foreign Currency Contracts [Member] \| Other Current Assets [Member]
Derivative Instruments [Abstract]
Designated asset derivative instruments	8	10
Foreign Currency Contracts [Member] \| Other Accruals [Member]
Derivative Instruments [Abstract]
Designated liability derivative instruments	8	10
Liability derivatives not designated	0	2
Commodity Contracts [Member] \| Other Current Assets [Member]
Derivative Instruments [Abstract]
Designated asset derivative instruments	0	4
Commodity Contracts [Member] \| Other Accruals [Member]
Derivative Instruments [Abstract]
Designated liability derivative instruments	$ 3	$ 0

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- Definition

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

+ Details

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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.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph b

+ Details

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- Definition

Fair value of a derivative asset (or nonderivative instrument) that is designated and qualifies as a hedging instrument, 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.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph a

-Clause 1

+ Details

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- Definition

Fair value of a derivative asset that is not designated or qualifying as a hedging instrument, 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.

+ References

+ Details

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- Definition

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.

+ References

+ Details

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- Definition

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.

+ References

+ Details

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- Definition

Fair value of a derivative liability (or nonderivative instrument) that is designated and qualifies as a hedging instrument, 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.

+ References

+ Details

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- Definition

Fair value of a derivative liability that is not designated or qualifying as a hedging instrument, 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.

+ References

+ Details

Name:	us-gaap_DerivativeLiabilityNotDesignatedAsHedgingInstrumentFairValue
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Data Type:	xbrli:monetaryItemType
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- Definition

This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph a

+ Details

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