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Marketable Securities (Details) - USD ($) $ in Millions | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments | $ 4 | $ 1
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments | (1) | (12)
Available-for-sale Securities, Amortized Cost Basis | 798 | 1,011
Available-for-sale Securities | 801 | 1,000
United States Government Obligations [Member] | Maturity Less Than 1 Year [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 262 | 385
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 | 262 | 385
United States Government Obligations [Member] | Maturity 1 To 5 Years [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 107 | 93
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 | 107 | 93
Corporate Debt Securities [Member] | Maturity 1 To 5 Years [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 70 | 72
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 | 70 | 72
Other Debt Securities [Member] | Maturity Less Than 1 Year [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 47 | 130
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 | 47 | 130
Other Debt Securities [Member] | Maturity 1 To 5 Years [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 3 | 3
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 | 3 | 3
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments | 4 | 1
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments | (1) | (12)
Available-for-sale Equity Securities, Amortized Cost Basis | 309 | 328
Available-for-sale Securities, Equity Securities | $ 312 | $ 317

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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=27724398&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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- 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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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified 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 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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