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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2018
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis |
Assets Measured at Fair Value
| March | December
| 2018 | 2017
Cash and cash equivalents | $ | 2,179 |  | $ | 2,542 |
Trading marketable securities | 125 |  | 121 |
Level 1 - Assets | $ | 2,304 |  | $ | 2,663 |
Available-for-sale marketable securities: |  |
Corporate and asset-backed debt securities | $ | 113 |  | $ | 125 |
Foreign government debt securities | 4 |  | 2 |
United States agency debt securities | 28 |  | 27 |
United States Treasury debt securities | 74 |  | 70 |
Certificates of deposit | 57 |  | 27 |
Total available-for-sale marketable securities | $ | 276 |  | $ | 251 |
Foreign currency exchange forward contracts | 15 |  | 15 |
Interest rate swap asset | — |  | 49 |
Level 2 - Assets | $ | 291 |  | $ | 315 |
Total assets measured at fair value | $ | 2,595 |  | $ | 2,978 |
Liabilities Measured at Fair Value
| March | December
| 2018 | 2017
Deferred compensation arrangements | $ | 125 |  | $ | 121 |
Level 1 - Liabilities | $ | 125 |  | $ | 121 |
Foreign currency exchange forward contracts | $ | 80 |  | $ | 37 |
Level 2 - Liabilities | $ | 80 |  | $ | 37 |
Contingent consideration: |  |
Beginning | $ | 32 |  | $ | 86 |
Additions | 78 |  | 3 |
Change in estimate | — |  | 2 |
Settlements | (2 | ) | (59 | )
Ending | $ | 108 |  | $ | 32 |
Level 3 - Liabilities | $ | 108 |  | $ | 32 |
Total liabilities measured at fair value | $ | 313 |  | $ | 190 |
Investments Classified by Contractual Maturity Date |
Fair Value of Available for Sale Securities by Maturity
| March 2018 | December 2017
Due in one year or less | $ | 128 |  | $ | 107 |
Due after one year through three years | $ | 148 |  | $ | 144 |
Schedule of Unrealized Loss on Investments |
Securities in a Continuous Unrealized Loss Position
| Number of Investments | Fair Value
Corporate and asset-backed | 124 | $ | 100 |
Foreign government | 1 | 2 |
United States agency | 17 | 28 |
United States Treasury | 25 | 74 |
Certificates of deposit | 44 | 54 |
Total | 211 | $ | 258 |

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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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