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Marketable Securities | 3 Months Ended
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Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities [Text Block] | Marketable Securities
| March 31, 2019 |  | December 31, 2018
| Cost |  | Unrealized Gain (Loss) |  | Fair Value |  | Cost |  | Unrealized Gain (Loss) |  | Fair Value
U.S. government securities | $ | 2 |  |  | $ | — |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 2 |
Corporate securities | 4 |  |  |  |  |  | 4 |  |  | 4 |  |  |  |  |  | 4 |
Certificates of deposit | 14 |  |  |  |  |  | 14 |  |  | 15 |  |  |  |  |  | 15 |
Total marketable securities | $ | 20 |  |  | $ | — |  |  | $ | 20 |  |  | $ | 21 |  |  | $ | — |  |  | $ | 21 |
U.S. government securities include bonds issued by government-sponsored agencies and Treasury notes. Corporate securities are primarily debt securities. 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 $15, $2 and $3 at March 31, 2019.

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