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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2019
Investments Debt And Equity Securities [Abstract] |
Changes in Value of Marketable Securities Reported in Current Assets on Consolidated Balance Sheets | Changes in the value of marketable securities, as reported in current assets on the consolidated balance sheets as at December 31, 2019 and December 31, 2018 are detailed in the tables below:
|  | December 31, 2018 |  |  | Purchase |  |  | Proceeds at maturity |  |  | Change in fair value included in OCI* |  |  | Change in fair value recognized in earnings |  |  | December 31, 2019 |
U.S. Treasury debt securities |  |  | 330 |  |  |  | — |  |  |  | (200 | ) |  |  | 3 |  |  |  | — |  |  |  | 133 |
Total |  |  | 330 |  |  |  | — |  |  |  | (200 | ) |  |  | 3 |  |  |  | — |  |  |  | 133 |
* | Other Comprehensive Income
|  | December 31, 2017 |  |  | Purchase |  |  | Proceeds at maturity |  |  | Change in fair value included in OCI* |  |  | Change in fair value recognized in earnings |  |  | December 31, 2018 |
U.S. Treasury debt securities |  |  | 431 |  |  |  | — |  |  |  | (100 | ) |  |  | (1 | ) |  |  | — |  |  |  | 330 |
Total |  |  | 431 |  |  |  | — |  |  |  | (100 | ) |  |  | (1 | ) |  |  | — |  |  |  | 330 |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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