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Short-Term Deposits and Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2020
Investments Debt And Equity Securities [Abstract] |
Changes in Value of Marketable Securities Reported in Current Assets on Consolidated Balance Sheets | To optimize the return yield on its short-term investments, the Company invested $581 million of available cash in short-term deposits as at December 31, 2020. These short-term deposits represent cash equivalents with original maturity beyond three months and no significant risk of changes in fair value. Changes in the fair value of marketable securities, as reported in current assets on the consolidated balance sheets as at December 31, 2020 and December 31, 2019 are detailed in the tables below:
|  | December 31, 2019 |  |  | Purchase |  |  | Proceeds at maturity |  |  | Change in fair value included in OCI* |  |  | Change in fair value recognized in earnings |  |  | December 31, 2020 |
U.S. Treasury debt securities |  |  | 133 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 133 |
Total |  |  | 133 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 133 |
* | Other Comprehensive Income
|  | 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

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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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