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Financial Instruments (Schedule Of Financial Instruments Measured And Recorded At Fair Value On Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Financial Instrument [Line Items]
Cash equivalents	$ 894	$ 739
Marketable securities	564	896
Long-term marketable securities	180	149
Other assets	10	10
Total liabilities measured at fair value	1	2
Assets, Fair Value Disclosure	1,648	1,794
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Financial Instrument [Line Items]
Cash equivalents	294	738
Marketable securities	1	0
Long-term marketable securities	1	9
Other assets	10	10
Total liabilities measured at fair value	0	0
Assets, Fair Value Disclosure	306	757
Significant Other Observable Inputs (Level 2) [Member]
Financial Instrument [Line Items]
Cash equivalents	600	1
Marketable securities	531	858
Long-term marketable securities	179	140
Other assets	0	0
Total liabilities measured at fair value	1	2
Assets, Fair Value Disclosure	1,310	999
Significant Unobservable Inputs (Level 3) [Member]
Financial Instrument [Line Items]
Cash equivalents	0	0
Marketable securities	32	38
Long-term marketable securities	0	0
Other assets	0	0
Total liabilities measured at fair value	0	0
Assets, Fair Value Disclosure	32	38
Money Market Funds [Member]
Financial Instrument [Line Items]
Cash equivalents	294	738
Long-term marketable securities	1	9
Other assets	10	10
Money Market Funds [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Financial Instrument [Line Items]
Cash equivalents	294	738
Long-term marketable securities	1	9
Other assets	10	10
Money Market Funds [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Financial Instrument [Line Items]
Cash equivalents	0	0
Long-term marketable securities	0	0
Other assets	0	0
Money Market Funds [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial Instrument [Line Items]
Cash equivalents	0	0
Long-term marketable securities	0	0
Other assets	0	0
Commercial Paper [Member]
Financial Instrument [Line Items]
Cash equivalents	350	1
Marketable securities	406	698
Commercial Paper [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Financial Instrument [Line Items]
Cash equivalents	0	0
Marketable securities	0	0
Commercial Paper [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Financial Instrument [Line Items]
Cash equivalents	350	1
Marketable securities	406	698
Commercial Paper [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial Instrument [Line Items]
Cash equivalents	0	0
Marketable securities	0	0
U.S. Treasury and U.S. Agency Notes [Member]
Financial Instrument [Line Items]
Cash equivalents	250
Marketable securities	50
U.S. Treasury and U.S. Agency Notes [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Financial Instrument [Line Items]
Cash equivalents	0
Marketable securities	0
U.S. Treasury and U.S. Agency Notes [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Financial Instrument [Line Items]
Cash equivalents	250
Marketable securities	50
U.S. Treasury and U.S. Agency Notes [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial Instrument [Line Items]
Cash equivalents	0
Marketable securities	0
Time Deposits [Member]
Financial Instrument [Line Items]
Marketable securities	75	160
Time Deposits [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Financial Instrument [Line Items]
Marketable securities	0	0
Time Deposits [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Financial Instrument [Line Items]
Marketable securities	75	160
Time Deposits [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial Instrument [Line Items]
Marketable securities	0	0
Auction Rate Securities [Member]
Financial Instrument [Line Items]
Marketable securities	32	38
Auction Rate Securities [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Financial Instrument [Line Items]
Marketable securities	0	0
Auction Rate Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Financial Instrument [Line Items]
Marketable securities	0	0
Auction Rate Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial Instrument [Line Items]
Marketable securities	32	38
Marketable Equity Securities [Member]
Financial Instrument [Line Items]
Marketable securities	1
Marketable Equity Securities [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Financial Instrument [Line Items]
Marketable securities	1
Marketable Equity Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Financial Instrument [Line Items]
Marketable securities	0
Marketable Equity Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial Instrument [Line Items]
Marketable securities	0
Corporate Bonds [Member]
Financial Instrument [Line Items]
Long-term marketable securities	179	140
Corporate Bonds [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Financial Instrument [Line Items]
Long-term marketable securities	0	0
Corporate Bonds [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Financial Instrument [Line Items]
Long-term marketable securities	179	140
Corporate Bonds [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial Instrument [Line Items]
Long-term marketable securities	0	0
Foreign Currency Derivative Contracts [Member]
Financial Instrument [Line Items]
Total liabilities measured at fair value	1	2
Foreign Currency Derivative Contracts [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Financial Instrument [Line Items]
Total liabilities measured at fair value	0	0
Foreign Currency Derivative Contracts [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Financial Instrument [Line Items]
Total liabilities measured at fair value	1	2
Foreign Currency Derivative Contracts [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial Instrument [Line Items]
Total liabilities measured at fair value	$ 0	$ 0

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 includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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