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Marketable Securities - Schedule of Marketable Securities (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 39 | $ 30
Unrealized Gains (Losses) | 1 | 0
Fair Value | 40 | 30
US Treasury and Government [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 3 | 2
Unrealized Gains (Losses) | 0 | 0
Fair Value | 3 | 2
Corporate Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 5 | 2
Unrealized Gains (Losses) |  |
Fair Value | 5 | 2
Certificates of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 27 | 22
Unrealized Gains (Losses) |  |
Fair Value | 27 | 22
Other Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 4 | 4
Unrealized Gains (Losses) | 1 |
Fair Value | $ 5 | $ 4

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- Definition Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
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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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- Definition Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer. + 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=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 + Details
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