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Assets And Liabilities Measured At Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2012
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Dec. 31, 2011
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| Short term marketable securities | $ 67 | $ 299 |
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Fair Value, Inputs, Level 1 [Member]
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| Cash Equivalents, at Carrying Value | 1,224 | 1,845 |
| Short term marketable securities | 0 | 0 |
| Available-for-sale securities | 978 | 1,441 |
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Fair Value, Inputs, Level 2 [Member]
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| Cash Equivalents, at Carrying Value | 0 | 21 |
| Short term marketable securities | 67 | 299 |
| Available-for-sale securities | 383 | 410 |
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Fair Value, Inputs, Level 3 [Member]
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| Cash Equivalents, at Carrying Value | 0 | 0 |
| Short term marketable securities | 0 | 0 |
| Available-for-sale securities | 0 | 0 |
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Estimate of Fair Value, Fair Value Disclosure [Member]
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| Cash Equivalents, at Carrying Value | 1,224 | 1,866 |
| Short term marketable securities | 67 | 299 |
| Available-for-sale securities | $ 1,361 | $ 1,851 |
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale which are intended to be held for less than one year or the normal operating cycle, whichever is longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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