Cash, money market funds and certificates of deposits with maturities of three months or less when purchased are included in Cash and cash equivalents on the Condensed Consolidated Statements of Financial Position. As March 31, 2020 and December 31, 2019, our marketable securities consisted primarily of common debt securities (“Debt securities”) and common equity securities (“Equity securities”). The amortized cost, fair value and gross realized and unrealized gains and losses of our short- and long-term investments in Debt and Equity securities are as follows:


			Gross Realized		Gross Realized
	Amortized		and Unrealized		and Unrealized		Fair
(In millions)	Cost		Gains		Losses		Value
March 31, 2020:
Debt securities	$	4	$	—	$	—	$	4
Equity securities		8		—		—		8
Total securities	$	12	$	—	$	—	$	12
December 31, 2019:
Debt securities	$	4	$	—	$	—	$	4
Equity securities		9		—		—		9
Total securities	$	13	$	—	$	—	$	13

We account for Equity securities at fair value with adjustments to fair value recognized in Interest and net investment income in the Condensed Consolidated Statements of Operations and Comprehensive Income. For the three months ended March 31, 2020, approximately $1 million of unrealized loss were recognized within Interest and net investment income in the Condensed Consolidated Statements of Operations and Comprehensive Income. There were no unrealized gains or losses recognized for the three months ended March 31, 2019.

We periodically review our Debt securities to determine whether an allowance for credit losses is necessary. There were no credit losses due to declines in the value of these investments recognized for the three months ended March 31, 2020 and 2019.

Additionally, we hold minority interests in several strategic investments that do not have readily determinable fair values and are recorded at cost and are remeasured upon the occurrence of observable price changes or impairments. We account for these investments at fair value with adjustments to fair value recognized in our Condensed Consolidated Statements of Operations and Comprehensive Income within Interest and net investment income. The investments are included within Other Assets on the Condensed Consolidated Statements of Financial Position. At March 31, 2020, the carrying amount of these investments was $4 million.