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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
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Dec. 31, 2011
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|---|---|---|
| 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 |
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Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
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| 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 |
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Significant Other Observable Inputs (Level 2) [Member]
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| 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 |
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Significant Unobservable Inputs (Level 3) [Member]
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| 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 |
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Money Market Funds [Member]
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| Financial Instrument [Line Items] | ||
| Cash equivalents | 294 | 738 |
| Long-term marketable securities | 1 | 9 |
| Other assets | 10 | 10 |
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Money Market Funds [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
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| Financial Instrument [Line Items] | ||
| Cash equivalents | 294 | 738 |
| Long-term marketable securities | 1 | 9 |
| Other assets | 10 | 10 |
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Money Market Funds [Member] | Significant Other Observable Inputs (Level 2) [Member]
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| Financial Instrument [Line Items] | ||
| Cash equivalents | 0 | 0 |
| Long-term marketable securities | 0 | 0 |
| Other assets | 0 | 0 |
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Money Market Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
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| Financial Instrument [Line Items] | ||
| Cash equivalents | 0 | 0 |
| Long-term marketable securities | 0 | 0 |
| Other assets | 0 | 0 |
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Commercial Paper [Member]
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| Financial Instrument [Line Items] | ||
| Cash equivalents | 350 | 1 |
| Marketable securities | 406 | 698 |
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Commercial Paper [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
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| Financial Instrument [Line Items] | ||
| Cash equivalents | 0 | 0 |
| Marketable securities | 0 | 0 |
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Commercial Paper [Member] | Significant Other Observable Inputs (Level 2) [Member]
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| Financial Instrument [Line Items] | ||
| Cash equivalents | 350 | 1 |
| Marketable securities | 406 | 698 |
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Commercial Paper [Member] | Significant Unobservable Inputs (Level 3) [Member]
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| Financial Instrument [Line Items] | ||
| Cash equivalents | 0 | 0 |
| Marketable securities | 0 | 0 |
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U.S. Treasury and U.S. Agency Notes [Member]
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| 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]
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| Financial Instrument [Line Items] | ||
| Cash equivalents | 0 | |
| Marketable securities | 0 | |
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U.S. Treasury and U.S. Agency Notes [Member] | Significant Other Observable Inputs (Level 2) [Member]
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| 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]
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| Financial Instrument [Line Items] | ||
| Cash equivalents | 0 | |
| Marketable securities | 0 | |
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Time Deposits [Member]
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| Financial Instrument [Line Items] | ||
| Marketable securities | 75 | 160 |
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Time Deposits [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
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| Financial Instrument [Line Items] | ||
| Marketable securities | 0 | 0 |
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Time Deposits [Member] | Significant Other Observable Inputs (Level 2) [Member]
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| Financial Instrument [Line Items] | ||
| Marketable securities | 75 | 160 |
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Time Deposits [Member] | Significant Unobservable Inputs (Level 3) [Member]
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| Financial Instrument [Line Items] | ||
| Marketable securities | 0 | 0 |
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Auction Rate Securities [Member]
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| Financial Instrument [Line Items] | ||
| Marketable securities | 32 | 38 |
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Auction Rate Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
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| Financial Instrument [Line Items] | ||
| Marketable securities | 0 | 0 |
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Auction Rate Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
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| Financial Instrument [Line Items] | ||
| Marketable securities | 0 | 0 |
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Auction Rate Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
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| Financial Instrument [Line Items] | ||
| Marketable securities | 32 | 38 |
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Marketable Equity Securities [Member]
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| Financial Instrument [Line Items] | ||
| Marketable securities | 1 | |
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Marketable Equity Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
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| Financial Instrument [Line Items] | ||
| Marketable securities | 1 | |
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Marketable Equity Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
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| Financial Instrument [Line Items] | ||
| Marketable securities | 0 | |
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Marketable Equity Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
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| Financial Instrument [Line Items] | ||
| Marketable securities | 0 | |
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Corporate Bonds [Member]
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| Financial Instrument [Line Items] | ||
| Long-term marketable securities | 179 | 140 |
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Corporate Bonds [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
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| Financial Instrument [Line Items] | ||
| Long-term marketable securities | 0 | 0 |
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Corporate Bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]
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| Financial Instrument [Line Items] | ||
| Long-term marketable securities | 179 | 140 |
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Corporate Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member]
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| Financial Instrument [Line Items] | ||
| Long-term marketable securities | 0 | 0 |
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Foreign Currency Derivative Contracts [Member]
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| Financial Instrument [Line Items] | ||
| Total liabilities measured at fair value | 1 | 2 |
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Foreign Currency Derivative Contracts [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
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| Financial Instrument [Line Items] | ||
| Total liabilities measured at fair value | 0 | 0 |
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Foreign Currency Derivative Contracts [Member] | Significant Other Observable Inputs (Level 2) [Member]
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| Financial Instrument [Line Items] | ||
| Total liabilities measured at fair value | 1 | 2 |
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Foreign Currency Derivative Contracts [Member] | Significant Unobservable Inputs (Level 3) [Member]
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| Financial Instrument [Line Items] | ||
| Total liabilities measured at fair value | $ 0 | $ 0 |