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Investments and Marketable Securities | 12 Months Ended
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Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract] |
Investments and Marketable Securities | Investments and Marketable Securities Investments in marketable debt securities are classified based on intent and ability to sell investment securities. The Company’s available-for-sale securities are used to fund future acquisitions and other operating needs and therefore can be sold prior to maturity. Investments in marketable debt securities for which the Company intends to sell within the next year are classified as current and those that we intend to hold in excess of one year are classified as non-current. Changes in the market value of available-for-sale securities are reflected in the accumulated other comprehensive income caption of stockholders’ equity in the balance sheet, until we dispose of the securities. Once these securities are disposed of, either by sale or maturity, the accumulated changes in market value are transferred to investment income. On the Consolidated Statements of Cash Flows, changes in the balances of available-for-sale securities are shown as purchases, sales and maturities of investments and marketable securities under investing activities. Changes in market value of trading securities would be recorded in investment income as they occur, and the related cash flow statement includes changes in the balances of trading securities as operating cash flows. As of December 31, 2015, there were no investments and marketable securities. For the years ended December 31, 2015, 2014 and 2013, changes in unrealized gains and losses on available-for-sale securities were immaterial. The following table shows the number, aggregate market value and unrealized losses (in millions) of investments with market values that were less than amortized cost as of December 31, 2014. These lower market values are primarily caused by fluctuations in interest rates and credit spreads. All remaining investments and marketable securities have been sold during 2015.
| Unrealized Loss < 12 months |  | Unrealized Loss > 12 months
| Number of investments |  | Aggregate Market Value |  | Unrealized Losses |  | Number of investments |  | Aggregate Market Value |  | Unrealized Losses
Government securities | — |  | $ | — |  |  | $ | — |  |  | 1 |  | $ | 8 |  |  | $ | — |
State and municipal bonds | — |  | — |  |  | — |  |  | 2 |  | 1 |  |  | — |
Corporate Securities | 1 |  | 1 |  |  | — |  |  | 11 |  | 3 |  |  | — |
Other | — |  | — |  |  | — |  |  | 1 |  | — |  |  | — |
Total | 1 |  | $ | 1 |  |  | $ | — |  |  | 15 |  | $ | 12 |  |  | $ | — |
Using the specific identification method, the proceeds and realized gains on the sales of available-for-sale securities were as follows (in millions):
| Year Ended December 31,
|  | 2015 |  | 2014 |  | 2013
Proceeds |  | $ | 25 |  |  | $ | 644 |  |  | $ | 337 |
Realized gains |  | — |  |  | 1 |  |  | 1 |
Realized losses |  | — |  |  | (1 | ) |  | — |
Net realized gains included in other comprehensive income (loss) as of the end of the prior year |  | — |  |  | — |  |  | — |
Included in the Company’s cash, restricted cash, investments and marketable securities are amounts held by foreign subsidiaries. The Company had $166 million as of December 31, 2015, and $268 million as of December 31, 2014 of foreign cash and investments out of the Company's total cash positions of $192 million and $394 million, respectively.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 2: 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=27724398&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 + Details
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