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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Marketable Securities, Gain (Loss) | $ 12 | $ 7 | $ 23 | $ 12
Corporate and asset-backed debt securities | Standard & Poor's, A Rating |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Percentage Of Company's Investments With Credit Quality Rating Less Than Single A And A2 |  |  | 1.00% |
Corporate and asset-backed debt securities | Moody's, A Rating |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Percentage Of Company's Investments With Credit Quality Rating Less Than Single A And A2 |  |  | 1.00% |
Corporate and asset-backed debt securities | Fitch, A Rating |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Percentage Of Company's Investments With Credit Quality Rating Less Than Single A And A2 |  |  | 1.00% |

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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(c)-(e) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27405-111563 + Details
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