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Marketable Securities - Schedule of Marketable Securities (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 157 | $ 164
Unrealized Gain (Loss) | 0 | 5
Fair Value | 157 | 169
US Treasury and Government [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 39 | 38
Unrealized Gain (Loss) | 0 | 0
Fair Value | 39 | 38
Corporate Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 41 | $ 36
Unrealized Gain (Loss) |  |
Fair Value | $ 41 | $ 36
Certificates of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 17 | $ 23
Unrealized Gain (Loss) |  |
Fair Value | $ 17 | $ 23
Other Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 60 | 67
Unrealized Gain (Loss) |  | 5
Fair Value | $ 60 | $ 72

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- Definition This item represents the cost of debt and equity 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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