exposure to international markets, we regularly monitor all of our material foreign currency exposures. We cannot predict whether we will incur foreign exchange gains or losses in the future. However, if significant foreign exchange losses are experienced, they could have a material adverse effect on our business, results of operations and financial condition.
We use sensitivity analysis to measure our foreign currency risk by computing the potential decrease in cash flows that may result from adverse changes in foreign exchange rates. The balances are segregated by source currency, and a hypothetical unfavorable variance in foreign exchange rates of 10% is applied to each net source currency position using
A portion of our
Historically, we have managed interest rate exposures, as they relate to interest expense, using a diversified portfolio of fixed and floating rate instruments denominated in several major currencies. We use sensitivity analysis to measure our interest rate risk. The sensitivity analysis includes cash, our outstanding floating rate
Equity price risk
The values of our equity investments in several publicly traded companies are subject to market price volatility. These investments are generally in companies in the technology industry sector and are classified as available for sale. We typically do not attempt to reduce or eliminate the market exposure on these investment securities. We also hold certain derivative instruments or warrants that are subject to market price volatility because their value is based on the common share price of a publicly traded company. These derivative instruments are generally acquired through business acquisitions or divestitures. In addition, derivative instruments may also be purchased to hedge exposure to certain compensation obligations that vary based on future Nortel Networks Corporation common share prices. We do not hold equity securities or derivative instruments for trading purposes. As of December 31, 2003, a hypothetical 20% adverse change in the stock prices of our publicly traded equity securities and the related underlying stock prices of publicly traded equity securities for certain of our derivative instruments would result in a loss in their aggregate fair values of $52 and $12, respectively, which would be offset by a corresponding reduction in future compensation expense. As of December 31, 2002, a hypothetical 20% adverse change in the stock prices of our publicly traded equity securities and the related underlying stock prices of publicly traded equity securities for certain of our derivative instruments would result in a loss in their aggregate fair values of $27.
Environmental matters
We are subject to numerous environmental protection laws and regulations in various jurisdictions around the world, primarily due to our manufacturing operations. As a result, we are exposed to liabilities and compliance costs arising from our past and current generation, management and disposition of hazardous substances and wastes.
We have remedial activities under way at twelve of our facilities which are either currently occupied or were previously owned or occupied. We have also been listed as a potentially responsible party at six Superfund sites in the U.S. An estimate of our anticipated remediation costs associated with all such facilities and sites, to the extent probable and reasonably estimable, is included in our environmental accruals in an approximate amount of $33.
For a discussion of Environmental matters, see “Contingencies” in note 22 of the accompanying consolidated financial statements.
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