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Marketable Securities (Tables)

12 Months Ended

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.

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