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Investments and Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract] |
Aggregate Market Value and Unrealized Losses of Investment | 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 |  |  | $ | — |
Schedule of Realized Gains on the Sales of Available-For-Sale Securities | 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 |  | — |  |  | — |  |  | — |

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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + 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) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + 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=27724398&loc=d3e27290-111563 + Details
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