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Marketable Securities (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments | $ 0 | $ 0
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments | 0 | (1)
Available-for-sale Securities, Amortized Cost Basis | 468 | 484
Available-for-sale Securities | 468 | 483
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments |  | 0
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments |  | 0
Available-for-sale Equity Securities, Amortized Cost Basis |  | 1
Available-for-sale Securities, Equity Securities |  | 1
Short-term marketable securities [Member] | United States Government Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 259 | 287
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments | 0 | 0
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments | 0 | 0
Available-for-sale Securities, Debt Securities | 259 | 287
Short-term marketable securities [Member] | Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 2 | 1
Available-for-sale Securities, Debt Securities | 2 | 1
Short-term marketable securities [Member] | Other Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis |  | 8
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments |  | 0
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments |  | 0
Available-for-sale Securities, Debt Securities |  | 8
Long-term marketable securities [Member] | United States Government Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 117 | 121
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments | 0 | 0
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments | 0 | (1)
Available-for-sale Securities, Debt Securities | 117 | 120
Long-term marketable securities [Member] | Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 90 | 66
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments | 0 | 0
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments | 0 | 0
Available-for-sale Securities, Debt Securities | $ 90 | $ 66

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: 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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