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Marketable Securities And Cash Equivalents (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost of marketable securities and cash equivalents | $ 2,250 | $ 2,340
Unrealized gains on marketable securities and cash equivalents | 11 | 3
Unrealized losses on marketable securities and cash equivalents | (10) | (5)
Fair value of marketable securities and cash equivalents | 2,251 | 2,338
United States Government Obligations [Member] | Maturity Less Than 1 Year [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 329 | 583
Unrealized gains on available for sale securities | 0 | 0
Unrealized losses on available for sale securities | 0 | 0
Fair Value | 329 | 583
United States Government Obligations [Member] | Maturity 1 To 5 Years [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 161 | 93
Unrealized gains on available for sale securities | 0 | 0
Unrealized losses on available for sale securities | 0 | 0
Fair Value | 161 | 93
Government-Sponsored Enterprise Obligations [Member] | Maturity 1 To 5 Years [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 2 | 2
Unrealized gains on available for sale securities | 0 | 0
Unrealized losses on available for sale securities | 0 | 0
Fair Value | 2 | 2
Corporate Debt Securities [Member] | Maturity Less Than 1 Year [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 1 |
Unrealized gains on available for sale securities | 0 |
Unrealized losses on available for sale securities | 0 |
Fair Value | 1 |
Corporate Debt Securities [Member] | Maturity 1 To 5 Years [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 13 | 15
Unrealized gains on available for sale securities | 0 | 0
Unrealized losses on available for sale securities | 0 | 0
Fair Value | 13 | 15
Other Debt Securities [Member] | Maturity Less Than 1 Year [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 1,201 | 1,038
Unrealized gains on available for sale securities | 0 | 0
Unrealized losses on available for sale securities | 0 | 0
Fair Value | 1,201 | 1,038
Other Debt Securities [Member] | Maturity 1 To 5 Years [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 3 | 3
Unrealized gains on available for sale securities | 0 | 0
Unrealized losses on available for sale securities | 0 | 0
Fair Value | 3 | 3
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 540 | 606
Unrealized gains on available for sale securities | 11 | 3
Unrealized losses on available for sale securities | (10) | (5)
Fair Value | $ 541 | $ 604

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- Definition This element represents the cost of marketable securities and cash equivalents. + References No definition available. + Details
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- Definition This element represents the fair value of marketable securities and cash equivalents. + References No definition available. + Details
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- Definition This element represents the unrealized gains on marketable securities and cash equivalents. + References No definition available. + Details
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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + 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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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