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Marketable Securities (Investments In Debt And Equity Securities) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost of marketable securities | $ 942 | $ 1,295
Unrealized gains on marketable securities | 1 | 3
Unrealized losses on marketable securities | (2) | (5)
Fair value of marketable securities | 941 | 1,293
United States Government Obligations [Member] | Maturity Less Than 1 Year [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 395 | 548
Fair Value | 395 | 548
United States Government Obligations [Member] | Maturity 1 To 5 Years [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 124 | 93
Fair Value | 124 | 93
Government-Sponsored Enterprise Obligations [Member] | Maturity 1 To 5 Years [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 4 | 2
Fair Value | 4 | 2
Corporate Debt Securities [Member] | Maturity 1 To 5 Years [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 16 | 15
Fair Value | 16 | 15
Other Debt Instruments [Member] | Maturity Less Than 1 Year [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 38 | 28
Fair Value | 38 | 28
Other Debt Instruments [Member] | Maturity 1 To 5 Years [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 3 | 3
Fair Value | 3 | 3
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 362 | 606
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments | 1 | 3
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments | (2) | (5)
Fair Value | $ 361 | $ 604

X
- Definition Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized loss on investments in available-for-sale debt securities impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale debt securities impacting investments. + References No definition available. + Details
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- Definition This element represents the cost of marketable securities. + References No definition available. + Details
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- Definition This element represents the fair value of marketable securities. + References No definition available. + Details
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- Definition This element represents the unrealized gains on marketable securities. + References No definition available. + Details
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- Definition This element represents unrealized losses on marketable securities. + 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 Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + 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=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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