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Marketable Securities | 12 Months Ended
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Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities |
| 3. | MARKETABLE SECURITIES
Changes in the value of marketable securities, as reported in current assets on the consolidated balance sheets as at December 31, 2016 and December 31, 2015 are detailed in the tables below:
|  | December 31, 2015 |  |  | Purchase |  |  | Sale |  |  | Change in fair value included in OCI* |  |  | Change in fair value recognized in earnings |  |  | December 31, 2016 |
U.S. Treasury Bonds |  |  | 335 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 335 |
Total |  |  | 335 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 335 |
* | Other Comprehensive Income
|  | December 31, 2014 |  |  | Purchase |  |  | Sale |  |  | Change in fair value included in OCI* |  |  | Change in fair value recognized in earnings |  |  | December 31, 2015 |
U.S. Treasury Bonds |  |  | 334 |  |  |  | — |  |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | 335 |
Total |  |  | 334 |  |  |  | — |  |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | 335 |
* | Other Comprehensive Income
As at December 31, 2016, the Company held $335 million in U.S. Treasury bonds. The bonds had an average rating of Aaa/AA+/AAA from Moody’s, S&P and Fitch, respectively, with a weighted average maturity of 3.3 years. The debt securities were reported as current assets on the line “Marketable Securities” on the consolidated balance sheet as at December 31, 2016, since they represented investments of funds available for current operations. The bonds were classified as available-for-sale and recorded at fair value as at December 31, 2016 and 2015, respectively. This fair value measurement corresponds to a Level 1 fair value hierarchy measurement. The aggregate amortized cost basis of these securities totaled $332 million as at December 31, 2016.

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