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Marketable Securities | 12 Months Ended
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Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | Marketable Securities
| 2014 |  | 2013
| Cost |  | Unrealized Gains (Losses) |  | Fair Value |  | Cost |  | Unrealized Gains (Losses) |  | Fair Value
U.S. government securities | $ | 38 |  |  | $ | — |  |  | $ | 38 |  |  | $ | 27 |  |  | $ | — |  |  | $ | 27 |
Corporate securities | 36 |  |  |  |  |  | 36 |  |  | 30 |  |  | (1 | ) |  | 29 |
Certificates of deposit | 23 |  |  |  |  |  | 23 |  |  | 21 |  |  |  |  | 21 |
Other | 67 |  |  | 5 |  |  | 72 |  |  | 31 |  |  | 2 |  |  | 33 |
Total marketable securities | $ | 164 |  |  | $ | 5 |  |  | $ | 169 |  |  | $ | 109 |  |  | $ | 1 |  |  | $ | 110 |
U.S. government securities include bonds issued by government-sponsored agencies and Treasury notes. Corporate securities include primarily debt securities. Other consists of investments in mutual and index funds. U.S. government securities, corporate debt and certificates of deposit maturing in one year or less, after one year through five years and after five years through ten years total $32, $64 and $1 at December 31, 2014.

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